diff --git a/internal/querynode/impl.go b/internal/querynode/impl.go
index 1d549543f3..76dfd1a5e4 100644
--- a/internal/querynode/impl.go
+++ b/internal/querynode/impl.go
@@ -328,6 +328,7 @@ func (node *QueryNode) LoadSegments(ctx context.Context, in *queryPb.LoadSegment
 	return waitFunc()
 }
 
+// ReleaseCollection clears all data related to this collecion on the querynode
 func (node *QueryNode) ReleaseCollection(ctx context.Context, in *queryPb.ReleaseCollectionRequest) (*commonpb.Status, error) {
 	code := node.stateCode.Load().(internalpb.StateCode)
 	if code != internalpb.StateCode_Healthy {