diff --git a/internal/distributed/querynode/client/client.go b/internal/distributed/querynode/client/client.go
index 9c3d84300c749b1bda744bf499a4600a75eb31cc..79b07a90cbfb1a839852e81e594a35bb1231a340 100644
--- a/internal/distributed/querynode/client/client.go
+++ b/internal/distributed/querynode/client/client.go
@@ -172,6 +172,7 @@ func (c *Client) Start() error {
 	return nil
 }
 
+// Stop stops QueryNode's grpc client server.
 func (c *Client) Stop() error {
 	c.cancel()
 	c.grpcClientMtx.Lock()