1 files changed, 1 insertions, 1 deletions
diff --git a/src/txmempool.h b/src/txmempool.h
index b4f52e6473..6a00b540a5 100644
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -420,7 +420,7 @@ private:
     unsigned int nTransactionsUpdated;
     CBlockPolicyEstimator* minerPolicyEstimator;
 
-    uint64_t totalTxSize;      //!< sum of all mempool tx' byte sizes
+    uint64_t totalTxSize;      //!< sum of all mempool tx's virtual sizes. Differs from serialized tx size since witness data is discounted. Defined in BIP 141.
     uint64_t cachedInnerUsage; //!< sum of dynamic memory usage of all the map elements (NOT the maps themselves)
 
     CFeeRate minReasonableRelayFee;