diff --git a/pkg/web_app/lib/src/widget/weekly_sparkline/widget.dart b/pkg/web_app/lib/src/widget/weekly_sparkline/widget.dart
index cacb741cb5..ef6eeae27e 100644
--- a/pkg/web_app/lib/src/widget/weekly_sparkline/widget.dart
+++ b/pkg/web_app/lib/src/widget/weekly_sparkline/widget.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:math';
 
 import 'package:_pub_shared/format/encoding.dart';