diff --git a/bin/cancel-my-orders b/bin/cancel-my-orders
index 8e18d43..34087c1 100755
--- a/bin/cancel-my-orders
+++ b/bin/cancel-my-orders
@@ -14,6 +14,10 @@ parser = argparse.ArgumentParser(description="Cancels all orders on a market fro
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol where orders are placed (e.g. ETH/USDC)")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -21,13 +25,15 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 orders = market_operations.load_my_orders()
 for order in orders:
     print("Cancelling:", order)
diff --git a/bin/cancel-order b/bin/cancel-order
index 9e41a4e..bf73de3 100755
--- a/bin/cancel-order
+++ b/bin/cancel-order
@@ -20,6 +20,10 @@ parser.add_argument("--client-id", type=int,
                     help="client ID of the order to cancel (either --client-id must be specified, or both --id and --side must be specified")
 parser.add_argument("--side", type=mango.Side, default=mango.Side.BUY, choices=list(mango.Side),
                     help="whether the order to cancel is a BUY or a SELL (either --client-id must be specified, or both --id and --side must be specified")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -27,13 +31,15 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 
 order = mango.Order.from_ids(id=args.id, client_id=args.client_id, side=args.side)
 cancellation = market_operations.cancel_order(order)
diff --git a/bin/crank-market b/bin/crank-market
index 978c376..6150354 100755
--- a/bin/crank-market
+++ b/bin/crank-market
@@ -17,6 +17,10 @@ mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol to make market upon (e.g. ETH/USDC)")
 parser.add_argument("--limit", type=Decimal, default=Decimal(32), help="maximum number of events to be processed")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -24,6 +28,8 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 logging.info(f"Context: {context}")
 logging.info(f"Wallet address: {wallet.address}")
@@ -33,7 +39,7 @@ market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 crank = market_operations.crank(args.limit)
 print(crank)
 
diff --git a/bin/hedger b/bin/hedger
index 9da7848..aafd421 100755
--- a/bin/hedger
+++ b/bin/hedger
@@ -22,12 +22,12 @@ parser = argparse.ArgumentParser(
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="perp market symbol to hedge (e.g. ETH-PERP)")
-parser.add_argument("--account-index", type=int, default=0,
-                    help="index of the account to use, if more than one available")
 parser.add_argument("--max-price-slippage-factor", type=Decimal, default=Decimal("0.05"),
                     help="the maximum value the IOC hedging order price can slip by (default is 0.05 for 5%)")
 parser.add_argument("--notify-errors", type=mango.parse_subscription_target, action="append", default=[],
                     help="The notification target for error events")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
 parser.add_argument("--dry-run", action="store_true", default=False,
                     help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
@@ -44,10 +44,7 @@ logger: logging.Logger = logging.getLogger("Hedger")
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
 group = mango.Group.load(context, context.group_id)
-accounts = mango.Account.load_all_for_owner(context, wallet.address, group)
-if len(accounts) == 0:
-    raise Exception(f"No mango account found for root address '{wallet.address}'.")
-account = accounts[args.account_index]
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 disposer = mango.DisposePropagator()
 manager = mango.WebSocketSubscriptionManager()
@@ -76,7 +73,7 @@ if not isinstance(hedging_market, mango.SpotMarket):
     raise Exception(f"Market {hedging_market_symbol} is not a spot market.")
 
 hedging_market_operations: mango.MarketOperations = mango.create_market_operations(
-    context, wallet, args.dry_run, hedging_market)
+    context, wallet, account, hedging_market, args.dry_run)
 
 initial: mango.PerpEventQueue = mango.PerpEventQueue.load(
     context, watched_market.underlying_perp_market.event_queue, watched_market.lot_size_converter)
diff --git a/bin/marketmaker b/bin/marketmaker
index 924274e..4f02759 100755
--- a/bin/marketmaker
+++ b/bin/marketmaker
@@ -21,8 +21,6 @@ parser = argparse.ArgumentParser(description="Shows the on-chain data of a parti
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol to make market upon (e.g. ETH/USDC)")
-parser.add_argument("--account-index", type=int, default=0,
-                    help="index of the account to use, if more than one available")
 parser.add_argument("--oracle-provider", type=str, required=True,
                     help="name of the price provider to use (e.g. pyth)")
 parser.add_argument("--position-size-ratio", type=Decimal, required=True,
@@ -37,6 +35,8 @@ parser.add_argument("--order-type", type=mango.OrderType, default=mango.OrderTyp
                     choices=list(mango.OrderType), help="Order type: LIMIT, IOC or POST_ONLY")
 parser.add_argument("--pulse-interval", type=int, default=10,
                     help="number of seconds between each 'pulse' of the market maker")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
 parser.add_argument("--dry-run", action="store_true", default=False,
                     help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
@@ -45,9 +45,10 @@ logging.getLogger().setLevel(args.log_level)
 logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 
-def cleanup(context: mango.Context, wallet: mango.Wallet, dry_run: bool, market: mango.Market):
+def cleanup(context: mango.Context, wallet: mango.Wallet, account: mango.Account, market: mango.Market, dry_run: bool):
     logging.info("Cleaning up.")
-    market_operations: mango.MarketOperations = mango.create_market_operations(context, wallet, dry_run, market)
+    market_operations: mango.MarketOperations = mango.create_market_operations(
+        context, wallet, account, market, dry_run)
     orders = market_operations.load_my_orders()
     for order in orders:
         market_operations.cancel_order(order)
@@ -184,10 +185,7 @@ disposer.add_disposable(manager)
 
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
 group = mango.Group.load(context, context.group_id)
-accounts = mango.Account.load_all_for_owner(context, wallet.address, group)
-if len(accounts) == 0:
-    raise Exception(f"No mango account found for root address '{wallet.address}'.")
-account = accounts[args.account_index]
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
@@ -199,7 +197,7 @@ if market.quote != group.shared_quote_token.token:
     raise Exception(
         f"Group {group.name} uses shared quote token {group.shared_quote_token.token.symbol}/{group.shared_quote_token.token.mint}, but market {market.symbol} uses quote token {market.quote.symbol}/{market.quote.mint}.")
 
-cleanup(context, wallet, args.dry_run, market)
+cleanup(context, wallet, account, market, args.dry_run)
 
 latest_group_observer = build_latest_group_observer(context, manager, disposer, group)
 account_subscription, latest_account_observer = build_latest_account_observer(
@@ -208,7 +206,7 @@ latest_price_observer = build_latest_price_observer(context, disposer, args.orac
 
 market = mango.ensure_market_loaded(context, market)
 market_instruction_builder: mango.MarketInstructionBuilder = mango.create_market_instruction_builder(
-    context, wallet, args.dry_run, market, account)
+    context, wallet, account, market, args.dry_run)
 if isinstance(market, mango.SerumMarket):
     latest_perp_market_observer = None
     latest_open_orders_observer = build_latest_serum_open_orders_observer(manager, disposer, market, context, wallet)
@@ -260,5 +258,5 @@ except:
 logging.info("Shutting down...")
 ws.close()
 disposer.dispose()
-cleanup(context, wallet, args.dry_run, market)
+cleanup(context, wallet, account, market, args.dry_run)
 logging.info("Shutdown complete.")
diff --git a/bin/place-order b/bin/place-order
index 39786d0..aae84db 100755
--- a/bin/place-order
+++ b/bin/place-order
@@ -21,6 +21,10 @@ parser.add_argument("--price", type=Decimal, required=True, help="price to BUY o
 parser.add_argument("--side", type=mango.Side, required=True, choices=list(mango.Side), help="side: BUY or SELL")
 parser.add_argument("--order-type", type=mango.OrderType, required=True,
                     choices=list(mango.OrderType), help="Order type: LIMIT, IOC or POST_ONLY")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -28,13 +32,15 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 order: mango.Order = mango.Order.from_basic_info(args.side, args.price, args.quantity, args.order_type)
 placed = market_operations.place_order(order)
 print(placed)
diff --git a/bin/settle-market b/bin/settle-market
index 3764a61..4f54f51 100755
--- a/bin/settle-market
+++ b/bin/settle-market
@@ -16,6 +16,10 @@ parser = argparse.ArgumentParser(description="Settles all openorders transaction
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol to make market upon (e.g. ETH/USDC)")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -23,6 +27,8 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 logging.info(f"Context: {context}")
 logging.info(f"Wallet address: {wallet.address}")
@@ -32,7 +38,7 @@ market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 settle = market_operations.settle()
 print(settle)
 
diff --git a/bin/show-my-orders b/bin/show-my-orders
index 84e9b08..0740ebe 100755
--- a/bin/show-my-orders
+++ b/bin/show-my-orders
@@ -14,6 +14,10 @@ parser = argparse.ArgumentParser(description="Shows all orders on the given mark
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol to buy (e.g. ETH/USDC)")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -21,13 +25,15 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 orders = market_operations.load_my_orders()
 print(f"{len(orders)} order(s) to show.")
 for order in orders:
diff --git a/bin/show-orders b/bin/show-orders
index 3d2b75c..f01790b 100755
--- a/bin/show-orders
+++ b/bin/show-orders
@@ -14,6 +14,10 @@ parser = argparse.ArgumentParser(description="Shows all orders on a market.")
 mango.ContextBuilder.add_command_line_parameters(parser)
 mango.Wallet.add_command_line_parameters(parser)
 parser.add_argument("--market", type=str, required=True, help="market symbol to buy (e.g. ETH/USDC)")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
+parser.add_argument("--dry-run", action="store_true", default=False,
+                    help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
 
 logging.getLogger().setLevel(args.log_level)
@@ -21,13 +25,15 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 
 context = mango.ContextBuilder.from_command_line_parameters(args)
 wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+group = mango.Group.load(context, context.group_id)
+account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
 market_symbol = args.market.upper()
 market = context.market_lookup.find_by_symbol(market_symbol)
 if market is None:
     raise Exception(f"Could not find market {market_symbol}")
 
-market_operations = mango.create_market_operations(context, wallet, False, market)
+market_operations = mango.create_market_operations(context, wallet, account, market, args.dry_run)
 orders = market_operations.load_orders()
 print(f"{len(orders)} order(s) to show.")
 for order in orders:
diff --git a/bin/simple-marketmaker b/bin/simple-marketmaker
index fd8159e..de3f43d 100755
--- a/bin/simple-marketmaker
+++ b/bin/simple-marketmaker
@@ -31,6 +31,8 @@ parser.add_argument("--pause-duration", type=int, default=10,
                     help="number of seconds to pause between placing orders and cancelling them")
 parser.add_argument("--oracle-provider", type=str, default="serum",
                     help="name of the oracle service providing the prices")
+parser.add_argument("--account-index", type=int, default=0,
+                    help="index of the account to use, if more than one available")
 parser.add_argument("--dry-run", action="store_true", default=False,
                     help="runs as read-only and does not perform any transactions")
 args = parser.parse_args()
@@ -41,13 +43,16 @@ logging.warning(mango.WARNING_DISCLAIMER_TEXT)
 try:
     context = mango.ContextBuilder.from_command_line_parameters(args)
     wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
+    group = mango.Group.load(context, context.group_id)
+    account = mango.Account.load_for_owner_by_index(context, wallet.address, group, args.account_index)
 
     market_symbol = args.market.upper()
     market = context.market_lookup.find_by_symbol(market_symbol)
     if market is None:
         raise Exception(f"Could not find spot market {market_symbol}")
 
-    market_operations: mango.MarketOperations = mango.create_market_operations(context, wallet, args.dry_run, market)
+    market_operations: mango.MarketOperations = mango.create_market_operations(
+        context, wallet, account, market, args.dry_run)
 
     oracle_provider: mango.OracleProvider = mango.create_oracle_provider(context, args.oracle_provider)
     oracle = oracle_provider.oracle_for_market(context, market)
diff --git a/mango/account.py b/mango/account.py
index 532ada9..060244e 100644
--- a/mango/account.py
+++ b/mango/account.py
@@ -134,9 +134,13 @@ class Account(AddressableAccount):
         return accounts
 
     @staticmethod
-    def load_primary_for_owner(context: Context, owner: PublicKey, group: Group) -> "Account":
-        # Don't try to do anything smart (yet). Just return the first account. Might need to be smarter in the future.
-        return Account.load_all_for_owner(context, owner, group)[0]
+    def load_for_owner_by_index(context: Context, owner: PublicKey, group: Group, account_index: int) -> "Account":
+        accounts: typing.Sequence[Account] = Account.load_all_for_owner(context, owner, group)
+        if len(accounts) == 0:
+            raise Exception(f"Could not find any Mango accounts for owner '{owner}'.")
+        if account_index >= len(accounts):
+            raise Exception(f"Could not find Mango account at index {account_index} for owner '{owner}'.")
+        return accounts[account_index]
 
     def __str__(self):
         def _render_list(items, stub):
diff --git a/mango/createmarketinstructionbuilder.py b/mango/createmarketinstructionbuilder.py
index 6b0f31b..ae49efc 100644
--- a/mango/createmarketinstructionbuilder.py
+++ b/mango/createmarketinstructionbuilder.py
@@ -14,8 +14,6 @@
 #   [Email](mailto:hello@blockworks.foundation)
 
 
-import typing
-
 from .account import Account
 from .context import Context
 from .ensuremarketloaded import ensure_market_loaded
@@ -34,7 +32,7 @@ from .wallet import Wallet
 # This function deals with the creation of a `MarketInstructionBuilder` object for a given `Market`.
 
 
-def create_market_instruction_builder(context: Context, wallet: Wallet, dry_run: bool, market: Market, account: typing.Optional[Account] = None) -> MarketInstructionBuilder:
+def create_market_instruction_builder(context: Context, wallet: Wallet, account: Account, market: Market, dry_run: bool = False) -> MarketInstructionBuilder:
     if dry_run:
         return NullMarketInstructionBuilder(market.symbol)
 
@@ -42,11 +40,9 @@ def create_market_instruction_builder(context: Context, wallet: Wallet, dry_run:
     if isinstance(loaded_market, SerumMarket):
         return SerumMarketInstructionBuilder.load(context, wallet, loaded_market)
     elif isinstance(loaded_market, SpotMarket):
-        spot_account: Account = account or Account.load_primary_for_owner(context, wallet.address, loaded_market.group)
-        return SpotMarketInstructionBuilder.load(context, wallet, loaded_market.group, spot_account, loaded_market)
+        return SpotMarketInstructionBuilder.load(context, wallet, loaded_market.group, account, loaded_market)
     elif isinstance(loaded_market, PerpMarket):
-        perp_account = account or Account.load_primary_for_owner(context, wallet.address, loaded_market.group)
         return PerpMarketInstructionBuilder.load(
-            context, wallet, loaded_market.group, perp_account, loaded_market)
+            context, wallet, loaded_market.group, account, loaded_market)
     else:
         raise Exception(f"Could not find market instructions builder for market {market.symbol}")
diff --git a/mango/createmarketoperations.py b/mango/createmarketoperations.py
index fe32f5a..5e4d39f 100644
--- a/mango/createmarketoperations.py
+++ b/mango/createmarketoperations.py
@@ -35,7 +35,7 @@ from .wallet import Wallet
 # This function deals with the creation of a `MarketOperations` object for a given `Market`.
 
 
-def create_market_operations(context: Context, wallet: Wallet, dry_run: bool, market: Market) -> MarketOperations:
+def create_market_operations(context: Context, wallet: Wallet, account: Account, market: Market, dry_run: bool = False) -> MarketOperations:
     if dry_run:
         return NullMarketOperations(market.symbol)
 
@@ -45,12 +45,10 @@ def create_market_operations(context: Context, wallet: Wallet, dry_run: bool, ma
             context, wallet, loaded_market)
         return SerumMarketOperations(context, wallet, loaded_market, serum_market_instruction_builder)
     elif isinstance(loaded_market, SpotMarket):
-        account: Account = Account.load_primary_for_owner(context, wallet.address, loaded_market.group)
         spot_market_instruction_builder: SpotMarketInstructionBuilder = SpotMarketInstructionBuilder.load(
             context, wallet, loaded_market.group, account, loaded_market)
         return SpotMarketOperations(context, wallet, loaded_market.group, account, loaded_market, spot_market_instruction_builder)
     elif isinstance(loaded_market, PerpMarket):
-        account = Account.load_primary_for_owner(context, wallet.address, loaded_market.group)
         perp_market_instruction_builder: PerpMarketInstructionBuilder = PerpMarketInstructionBuilder.load(
             context, wallet, loaded_market.underlying_perp_market.group, account, loaded_market)
         return PerpMarketOperations(loaded_market.symbol, context, wallet, perp_market_instruction_builder, account, loaded_market)
diff --git a/mango/ensuremarketloaded.py b/mango/ensuremarketloaded.py
index cc2fa4b..af1ac7b 100644
--- a/mango/ensuremarketloaded.py
+++ b/mango/ensuremarketloaded.py
@@ -21,9 +21,12 @@ from .perpmarket import PerpMarketStub
 from .serummarket import SerumMarketStub
 from .spotmarket import SpotMarketStub
 
-# # 🥭 create_market_instruction_builder
+# # 🥭 ensure_market_loaded function
 #
-# This function deals with the creation of a `MarketInstructionBuilder` object for a given `Market`.
+# This function ensures that a `Market` is 'loaded' and not a 'stub'. Stubs are handy for laoding in
+# bulk, for instance in a market lookup, but real processing usually requires a fully loaded `Market`.
+#
+# This function simplifies turning a stub into a fully-loaded, usable market.
 
 
 def ensure_market_loaded(context: Context, market: Market) -> Market: