diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e87280c..947fba7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ shielding funds, and then creating transactions from a proposal. The intermediat
 proposal can be used to determine the required fee, before committing to producing
 transactions.
 
+The old `Synchronizer.sendToAddress` and `Synchronizer.shieldFunds` APIs have been
+deprecated, and will be removed in 2.1.0 (which will create multiple transactions
+at once for some recipients).
+
 # 2.0.10 - 2024-02-12
 
 ## Added
diff --git a/Sources/ZcashLightClientKit/Synchronizer.swift b/Sources/ZcashLightClientKit/Synchronizer.swift
index c48f887d..79bdd067 100644
--- a/Sources/ZcashLightClientKit/Synchronizer.swift
+++ b/Sources/ZcashLightClientKit/Synchronizer.swift
@@ -209,6 +209,7 @@ public protocol Synchronizer: AnyObject {
     ///
     /// If `prepare()` hasn't already been called since creating of synchronizer instance or since the last wipe then this method throws
     /// `SynchronizerErrors.notPrepared`.
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     func sendToAddress(
         spendingKey: UnifiedSpendingKey,
         zatoshi: Zatoshi,
@@ -222,6 +223,7 @@ public protocol Synchronizer: AnyObject {
     ///
     /// If `prepare()` hasn't already been called since creating of synchronizer instance or since the last wipe then this method throws
     /// `SynchronizerErrors.notPrepared`.
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     func shieldFunds(
         spendingKey: UnifiedSpendingKey,
         memo: Memo,
diff --git a/Sources/ZcashLightClientKit/Synchronizer/ClosureSDKSynchronizer.swift b/Sources/ZcashLightClientKit/Synchronizer/ClosureSDKSynchronizer.swift
index 8db106dd..086b47e1 100644
--- a/Sources/ZcashLightClientKit/Synchronizer/ClosureSDKSynchronizer.swift
+++ b/Sources/ZcashLightClientKit/Synchronizer/ClosureSDKSynchronizer.swift
@@ -103,6 +103,7 @@ extension ClosureSDKSynchronizer: ClosureSynchronizer {
         }
     }
 
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     public func sendToAddress(
         spendingKey: UnifiedSpendingKey,
         zatoshi: Zatoshi,
@@ -115,6 +116,7 @@ extension ClosureSDKSynchronizer: ClosureSynchronizer {
         }
     }
 
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     public func shieldFunds(
         spendingKey: UnifiedSpendingKey,
         memo: Memo,
diff --git a/Sources/ZcashLightClientKit/Synchronizer/CombineSDKSynchronizer.swift b/Sources/ZcashLightClientKit/Synchronizer/CombineSDKSynchronizer.swift
index 2fef6c23..e30625a0 100644
--- a/Sources/ZcashLightClientKit/Synchronizer/CombineSDKSynchronizer.swift
+++ b/Sources/ZcashLightClientKit/Synchronizer/CombineSDKSynchronizer.swift
@@ -99,6 +99,7 @@ extension CombineSDKSynchronizer: CombineSynchronizer {
         }
     }
 
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     public func sendToAddress(
         spendingKey: UnifiedSpendingKey,
         zatoshi: Zatoshi,
@@ -110,6 +111,7 @@ extension CombineSDKSynchronizer: CombineSynchronizer {
         }
     }
 
+    @available(*, deprecated, message: "Upcoming SDK 2.1 will create multiple transactions at once for some recipients.")
     public func shieldFunds(
         spendingKey: UnifiedSpendingKey,
         memo: Memo,