diff --git a/pkgs/web_socket/lib/src/connect_stub.dart b/pkgs/web_socket/lib/src/connect_stub.dart
index 828a09dc63..3a420deeec 100644
--- a/pkgs/web_socket/lib/src/connect_stub.dart
+++ b/pkgs/web_socket/lib/src/connect_stub.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 '../web_socket.dart';
 
 Future<WebSocket> connect(Uri url, {Iterable<String>? protocols}) {