diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs b/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
index 9c0d7a7ec..6e50945e4 100644
--- a/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
+++ b/Assets/VRM/UniVRM/Scripts/Format/VRMFormat.cs
@@ -40,7 +40,7 @@ VRM extension is for 3d humanoid avatars (and models) in VR applications.
         [JsonSchema(Description = @"Version of exporter that vrm created. " + VRMVersion.VRM_VERSION)]
         public string exporterVersion = "UniVRM-" + VRMVersion.VERSION;
 
-        [JsonSchema(Description = @"The VRM specification version that this extension uses")]
+        [JsonSchema(Description = @"Version of VRM specification. " + VRMSpecVersion.VERSION)]
         public string specVersion  = VRMSpecVersion.Version;
 
         public glTF_VRM_Meta meta = new glTF_VRM_Meta();
diff --git a/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs b/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
index 98ece65e7..95872ee4e 100644
--- a/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
+++ b/Assets/VRM/UniVRM/Scripts/Format/VRMSpecVersion.cs
@@ -14,5 +14,7 @@ namespace VRM
                 return String.Format("{0}.{1}", Major, Minor);
             }
         }
+
+        public const string VERSION = "0.0";
     }
 }