diff --git a/internal/querynode/collection_replica.go b/internal/querynode/collection_replica.go
index 7c988d1f76ac7a79b0747a8b50e05749854dd695..3d6842464f9905cfad314628e4696c6dc87b6f81 100644
--- a/internal/querynode/collection_replica.go
+++ b/internal/querynode/collection_replica.go
@@ -430,6 +430,7 @@ func (colReplica *collectionReplica) removeSegment(segmentID UniqueID) error {
 	return colReplica.removeSegmentPrivate(segmentID)
 }
 
+// removeSegmentPrivate is private function in collectionReplica, to remove a segment from collectionReplica
 func (colReplica *collectionReplica) removeSegmentPrivate(segmentID UniqueID) error {
 	log.Debug("remove segment", zap.Int64("segmentID", segmentID))
 	segment, err := colReplica.getSegmentByIDPrivate(segmentID)