diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 71e1651ce1c54d6a556b0a8c13a8c4543daa86de..4a28cb4ff48e59976672300dca7fb71e56aa1e67 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -577,6 +577,7 @@ static void rpcReleaseConn(SRpcConn *pConn) {
     rpcFreeMsg(pConn->pRspMsg); // it may have a response msg saved, but not request msg
   } 
   
+  // lockedBy can not be reset, since it maybe hold by a thread
   int sid = pConn->sid;
   int64_t lockedBy = pConn->lockedBy; 
   memset(pConn, 0, sizeof(SRpcConn));