diff --git a/pkgs/messages/example_json/hook/build.dart b/pkgs/messages/example_json/hook/build.dart
index 95ff45ac..68127b3d 100644
--- a/pkgs/messages/example_json/hook/build.dart
+++ b/pkgs/messages/example_json/hook/build.dart
@@ -1,3 +1,7 @@
+// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'dart:io';
 
 import 'package:native_assets_cli/native_assets_cli.dart';