diff --git a/src/main.h b/src/main.h
index d810bff9..744c0e4b 100644
--- a/src/main.h
+++ b/src/main.h
@@ -24,21 +24,34 @@ class CNode;
 
 class CBlockIndexWorkComparator;
 
+/** The maximum allowed size for a serialized block, in bytes (network rule) */
 static const unsigned int MAX_BLOCK_SIZE = 1000000;
+/** The maximum size for mined blocks */
 static const unsigned int MAX_BLOCK_SIZE_GEN = MAX_BLOCK_SIZE/2;
+/** The maximum allowed number of signature check operations in a block (network rule) */
 static const unsigned int MAX_BLOCK_SIGOPS = MAX_BLOCK_SIZE/50;
+/** The maximum number of orphan transactions kept in memory */
 static const unsigned int MAX_ORPHAN_TRANSACTIONS = MAX_BLOCK_SIZE/100;
+/** The maximum number of entries in an 'inv' protocol message */
 static const unsigned int MAX_INV_SZ = 50000;
+/** The maximum size of a blk?????.dat file (since 0.8) */
 static const unsigned int MAX_BLOCKFILE_SIZE = 0x8000000; // 128 MiB
+/** The pre-allocation chunk size for blk?????.dat files (since 0.8) */
 static const unsigned int BLOCKFILE_CHUNK_SIZE = 0x1000000; // 16 MiB
+/** The pre-allocation chunk size for rev?????.dat files (since 0.8) */
 static const unsigned int UNDOFILE_CHUNK_SIZE = 0x100000; // 1 MiB
+/** Fake height value used in CCoins to signify they are only in the memory pool (since 0.8) */
 static const unsigned int MEMPOOL_HEIGHT = 0x7FFFFFFF;
+/** Fees smaller than this (in satoshi) are considered zero fee (for transaction creation) */
 static const int64 MIN_TX_FEE = 50000;
+/** Fees smaller than this (in satoshi) are considered zero fee (for relaying) */
 static const int64 MIN_RELAY_TX_FEE = 10000;
+/** No amount larger than this (in satoshi) is valid */
 static const int64 MAX_MONEY = 21000000 * COIN;
 inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
+/** Coinbase transaction outputs can only be spent after this number of new blocks (network rule) */
 static const int COINBASE_MATURITY = 100;
-// Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp.
+/** Threshold for nLockTime: below this value it is interpreted as block number, otherwise as UNIX timestamp. */
 static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov  5 00:53:20 1985 UTC
 #ifdef USE_UPNP
 static const int fHaveUPnP = true;