diff --git a/DeedyDesigner/Deedy.Activity/ActionViewer.cs b/DeedyDesigner/Deedy.Activity/ActionViewer.cs
index cc94ff4..3017a59 100644
--- a/DeedyDesigner/Deedy.Activity/ActionViewer.cs
+++ b/DeedyDesigner/Deedy.Activity/ActionViewer.cs
@@ -749,7 +749,6 @@ namespace Deedy.Activity
         protected internal DropPlacement _DropPlacement = DropPlacement.UnDragged;      // 用于最终放置逻辑
         protected override void OnDragOver(DragEventArgs e)
         {
-            //HACK：这里要考虑父容器的布局方向
             if (this.IsEventNeedToHandle(e.OriginalSource))
             {
                 this.RefreshViewerState(true);