diff --git a/packaging/cfg/taos.cfg b/packaging/cfg/taos.cfg
index 73004fe7b722d2fd2c15930f69a38d78aca4220d..5ac0e39dcc134260945d5328ac8035559574f277 100644
--- a/packaging/cfg/taos.cfg
+++ b/packaging/cfg/taos.cfg
@@ -270,3 +270,9 @@
 
 # in retrieve blocking model, only in 50% query threads will be used in query processing in dnode
 # retrieveBlockingModel    0
+
+# the maximum allowed query buffer size in MB during query processing for each data node
+# -1 no limit (default)
+# 0  no query allowed, queries are disabled
+# queryBufferSize         -1
+