diff --git a/internal/querynode/flow_graph_filter_delete_node.go b/internal/querynode/flow_graph_filter_delete_node.go
index 40f04451bf..03fd10622a 100644
--- a/internal/querynode/flow_graph_filter_delete_node.go
+++ b/internal/querynode/flow_graph_filter_delete_node.go
@@ -113,6 +113,7 @@ func (fddNode *filterDeleteNode) filterInvalidDeleteMessage(msg *msgstream.Delet
 	return msg
 }
 
+// newFilteredDeleteNode returns a new filterDeleteNode
 func newFilteredDeleteNode(replica ReplicaInterface,
 	collectionID UniqueID,
 	partitionID UniqueID) *filterDeleteNode {