diff --git a/servant-csharp.cabal b/servant-csharp.cabal
--- a/servant-csharp.cabal
+++ b/servant-csharp.cabal
@@ -2,7 +2,7 @@
 -- documentation, see http://haskell.org/cabal/users-guide/
 
 name:                servant-csharp
-version:             0.0.6.0
+version:             0.0.6.1
 synopsis:            Generate servant client library for C#
 description:         Generate servant client library for C#
 homepage:            https://github.com/cutsea110/servant-csharp.git
diff --git a/src/CS/JsonDotNet.hs b/src/CS/JsonDotNet.hs
--- a/src/CS/JsonDotNet.hs
+++ b/src/CS/JsonDotNet.hs
@@ -319,7 +319,7 @@
 defClassTemplate conf = do
   uas <- usingAliases conf
   classes <- classTypes conf
-  return [heredoc|
+  return [heredoc|/* generated by servant-csharp */
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
 using System;