diff --git a/DeedyDesigner/Deedy.Activity/Collection/ParamGroupCollection.cs b/DeedyDesigner/Deedy.Activity/Collection/ParamGroupCollection.cs
index cc32fc4..326bf2d 100644
--- a/DeedyDesigner/Deedy.Activity/Collection/ParamGroupCollection.cs
+++ b/DeedyDesigner/Deedy.Activity/Collection/ParamGroupCollection.cs
@@ -11,7 +11,7 @@ using System.Windows.Documents;
 namespace Deedy.Activity
 {
     [Serializable]
-    [DebuggerDisplay("Count = {Count}")]
+    [DebuggerDisplay("「ParamGroupCollection<ParamGroupAttribute>」Count = {Count}")]
     public class ParamGroupCollection : InitialSortedObservableCollection<ParamGroupAttribute>
     {
         private ParamGroupAttribute _DefaultGroup = ParamGroupAttribute.CreateDefaultGroup();