diff --git a/internal/querynode/collection_replica.go b/internal/querynode/collection_replica.go
index 834fc873129cde1cfc2047a7cf77205f654b1455..535fbe652d0d60b9ec010c9d5ac01e40ede127a4 100644
--- a/internal/querynode/collection_replica.go
+++ b/internal/querynode/collection_replica.go
@@ -73,6 +73,7 @@ type ReplicaInterface interface {
 	hasPartition(partitionID UniqueID) bool
 	// getPartitionNum returns num of partitions
 	getPartitionNum() int
+	// getSegmentIDs returns segment ids
 	getSegmentIDs(partitionID UniqueID) ([]UniqueID, error)
 	getSegmentIDsByVChannel(partitionID UniqueID, vChannel Channel) ([]UniqueID, error)