diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 4c9439f0a7fcef2e8ea8faee9670e7d008891876..e243002ff669704ca908fe987ecadf987fb3693b 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -667,6 +667,7 @@ void taos_stop_query(TAOS_RES *res) {
 
   // TODO there are multi-thread problem.
   // It may have been released by the other thread already.
+  // The ref count may fix this problem.
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
   if (tscIsTwoStageSTableQuery(pQueryInfo, 0)) {
     tscKillSTableQuery(pSql);