diff --git a/internal/querynode/query_node.go b/internal/querynode/query_node.go
index c4beac1042..ae653ce3de 100644
--- a/internal/querynode/query_node.go
+++ b/internal/querynode/query_node.go
@@ -245,6 +245,7 @@ func (node *QueryNode) Stop() error {
 	return nil
 }
 
+// UpdateStateCode updata the state of query node, which can be initializing, healthy, and abnormal
 func (node *QueryNode) UpdateStateCode(code internalpb.StateCode) {
 	node.stateCode.Store(code)
 }