diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMExportSettings.cs b/Assets/VRM/UniVRM/Scripts/Format/VRMExportSettings.cs
index 9a51acd6e3..9270c08864 100644
--- a/Assets/VRM/UniVRM/Scripts/Format/VRMExportSettings.cs
+++ b/Assets/VRM/UniVRM/Scripts/Format/VRMExportSettings.cs
@@ -73,6 +73,11 @@ public IEnumerable<string> CanExport()
             {
                 yield return "Require Author. ";
             }
+
+            if(ReduceBlendshapeSize && Source.GetComponent<VRMBlendShapeProxy>() == null)
+            {
+                yield return "ReduceBlendshapeSize is need VRMBlendShapeProxy, you need to convert to VRM once.";
+            }
         }
 
         public void InitializeFrom(GameObject go)