diff --git a/internal/querynode/collection_replica.go b/internal/querynode/collection_replica.go
index f5b592cf81..fa40baca74 100644
--- a/internal/querynode/collection_replica.go
+++ b/internal/querynode/collection_replica.go
@@ -118,6 +118,7 @@ type ReplicaInterface interface {
 
 	// getSegmentsMemSize get the memory size in bytes of all the Segments
 	getSegmentsMemSize() int64
+	// freeAll will free all meta info from collectionReplica
 	freeAll()
 	printReplica()
 }