diff --git a/Assets/VRM10/Editor/VRM10ExportSettings.cs b/Assets/VRM10/Editor/VRM10ExportSettings.cs
index 268d653a9..9b328e5a2 100644
--- a/Assets/VRM10/Editor/VRM10ExportSettings.cs
+++ b/Assets/VRM10/Editor/VRM10ExportSettings.cs
@@ -10,13 +10,13 @@ namespace UniVRM10
         /// <summary>
         /// エクスポート時にBlendShapeClipから参照されないBlendShapeを削除する
         /// </summary>
-        [Tooltip("Remove blendshape that is not used from BlendShapeClip")]
+        [Tooltip("not implemented yet. Remove blendshape that is not used from BlendShapeClip")][ReadOnly]
         public bool ReduceBlendshape = false;
 
         /// <summary>
         /// skip if BlendShapeClip.Preset == Unknown
         /// </summary>
-        [Tooltip("Remove blendShapeClip that preset is Unknown")]
+        [Tooltip("not implemented yet. Remove blendShapeClip that preset is Unknown")][ReadOnly]
         public bool ReduceBlendshapeClip = false;
 
         [Tooltip("Use sparse accessor for morph target")]