diff --git a/internal/distributed/querynode/service.go b/internal/distributed/querynode/service.go
index 088d9ab77a..dfffc104ee 100644
--- a/internal/distributed/querynode/service.go
+++ b/internal/distributed/querynode/service.go
@@ -269,6 +269,7 @@ func (s *Server) SetIndexCoord(indexCoord types.IndexCoord) error {
 	return s.querynode.SetIndexCoord(indexCoord)
 }
 
+// GetTimeTickChannel gets the time tick channel of QueryNode.
 func (s *Server) GetTimeTickChannel(ctx context.Context, req *internalpb.GetTimeTickChannelRequest) (*milvuspb.StringResponse, error) {
 	return s.querynode.GetTimeTickChannel(ctx)
 }