diff --git a/src/Api/AddDiscussionAttributes.php b/src/Api/AddDiscussionAttributes.php
index d01c5fb2..543b11bb 100644
--- a/src/Api/AddDiscussionAttributes.php
+++ b/src/Api/AddDiscussionAttributes.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of fof/polls.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\Polls\Api;
 
 use Flarum\Api\Serializer\DiscussionSerializer;
diff --git a/src/Api/AddForumAttributes.php b/src/Api/AddForumAttributes.php
index 4614490b..3160b127 100644
--- a/src/Api/AddForumAttributes.php
+++ b/src/Api/AddForumAttributes.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of fof/polls.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\Polls\Api;
 
 use Flarum\Api\Serializer\ForumSerializer;
diff --git a/src/Api/AddPostAttributes.php b/src/Api/AddPostAttributes.php
index b9f0306b..bb206dfd 100644
--- a/src/Api/AddPostAttributes.php
+++ b/src/Api/AddPostAttributes.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of fof/polls.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\Polls\Api;
 
 class AddPostAttributes
diff --git a/src/Listeners/ClearFormatterCache.php b/src/Listeners/ClearFormatterCache.php
index b427edb1..e5af563c 100644
--- a/src/Listeners/ClearFormatterCache.php
+++ b/src/Listeners/ClearFormatterCache.php
@@ -1,5 +1,14 @@
 <?php
 
+/*
+ * This file is part of fof/polls.
+ *
+ * Copyright (c) FriendsOfFlarum.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
 namespace FoF\Polls\Listeners;
 
 use Flarum\Settings\Event\Saved;