diff --git a/internal/querycoord/impl.go b/internal/querycoord/impl.go
index aa898ab164..e03935c281 100644
--- a/internal/querycoord/impl.go
+++ b/internal/querycoord/impl.go
@@ -354,6 +354,7 @@ func (qc *QueryCoord) LoadPartitions(ctx context.Context, req *querypb.LoadParti
 	return status, nil
 }
 
+// ReleasePartition clears all data related to this partition on the querynode
 func (qc *QueryCoord) ReleasePartitions(ctx context.Context, req *querypb.ReleasePartitionsRequest) (*commonpb.Status, error) {
 	//dbID := req.DbID
 	collectionID := req.CollectionID