diff --git a/internal/querycoord/task.go b/internal/querycoord/task.go
index 9ec4bf6cf9..667d1ff396 100644
--- a/internal/querycoord/task.go
+++ b/internal/querycoord/task.go
@@ -485,6 +485,7 @@ func (lct *LoadCollectionTask) rollBack(ctx context.Context) []task {
 	return resultTasks
 }
 
+// ReleaseCollectionTask will release all the data of this collection on query nodes
 type ReleaseCollectionTask struct {
 	*BaseTask
 	*querypb.ReleaseCollectionRequest