diff --git a/pkgs/puppy/lib/src/constants.dart b/pkgs/puppy/lib/src/constants.dart
index c1a32dd9..c8361ee0 100644
--- a/pkgs/puppy/lib/src/constants.dart
+++ b/pkgs/puppy/lib/src/constants.dart
@@ -1 +1,5 @@
+// Copyright (c) 2025, 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.
+
 const cmdName = 'puppy';