diff --git a/internal/querynode/collection_replica.go b/internal/querynode/collection_replica.go
index f295342140..a953dabbd0 100644
--- a/internal/querynode/collection_replica.go
+++ b/internal/querynode/collection_replica.go
@@ -69,6 +69,7 @@ type ReplicaInterface interface {
 	removePartition(partitionID UniqueID) error
 	// getPartitionByID returns the partition which id is partitionID
 	getPartitionByID(partitionID UniqueID) (*Partition, error)
+	// hasPartition returns true if collectionReplica has the partition, false otherwise
 	hasPartition(partitionID UniqueID) bool
 	getPartitionNum() int
 	getSegmentIDs(partitionID UniqueID) ([]UniqueID, error)