diff --git a/internal/querynode/collection_replica.go b/internal/querynode/collection_replica.go
index 2e3ba8a20d..cb542d78de 100644
--- a/internal/querynode/collection_replica.go
+++ b/internal/querynode/collection_replica.go
@@ -81,6 +81,7 @@ type ReplicaInterface interface {
 	// segment
 	// addSegment add a new segment to collectionReplica
 	addSegment(segmentID UniqueID, partitionID UniqueID, collectionID UniqueID, vChannelID Channel, segType segmentType, onService bool) error
+	// setSegment adds a segment to collectionReplica
 	setSegment(segment *Segment) error
 	// removeSegment removes a segment from collectionReplica
 	removeSegment(segmentID UniqueID) error