diff --git a/Tests/Encoder/IdnAddressEncoderTest.php b/Tests/Encoder/IdnAddressEncoderTest.php
index 71e7716..656225a 100644
--- a/Tests/Encoder/IdnAddressEncoderTest.php
+++ b/Tests/Encoder/IdnAddressEncoderTest.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace Symfony\Component\Mime\Encoder;
 
 use PHPUnit\Framework\TestCase;