diff --git a/internal/querynode/flow_graph_query_node.go b/internal/querynode/flow_graph_query_node.go
index 6b6c25be08..bd18a40e92 100644
--- a/internal/querynode/flow_graph_query_node.go
+++ b/internal/querynode/flow_graph_query_node.go
@@ -106,6 +106,7 @@ func newQueryNodeFlowGraph(ctx context.Context,
 	return q
 }
 
+// newQueryNodeDeltaFlowGraph returns a new queryNodeFlowGraph
 func newQueryNodeDeltaFlowGraph(ctx context.Context,
 	collectionID UniqueID,
 	historicalReplica ReplicaInterface,