diff --git a/framework/core/src/Mail/MutateEmail.php b/framework/core/src/Mail/MutateEmail.php
index 7a81e1fd98..b668ce401e 100644
--- a/framework/core/src/Mail/MutateEmail.php
+++ b/framework/core/src/Mail/MutateEmail.php
@@ -1,5 +1,12 @@
 <?php
 
+/*
+ * This file is part of Flarum.
+ *
+ * For detailed copyright and license information, please view the
+ * LICENSE file that was distributed with this source code.
+ */
+
 namespace Flarum\Mail;
 
 use Illuminate\Mail\Events\MessageSending;