diff --git a/Classes/Slot/AddCustomGroupsSlot.php b/Classes/Slot/AddCustomGroupsSlot.php
index 60e7734..2660b7d 100644
--- a/Classes/Slot/AddCustomGroupsSlot.php
+++ b/Classes/Slot/AddCustomGroupsSlot.php
@@ -1,10 +1,38 @@
 <?php
 namespace In2code\In2frontendauthentication\Slot;
 
+/***************************************************************
+ *  Copyright notice
+ *
+ *  (c) 2016 Alex Kellner <alexander.kellner@in2code.de>, in2code.de
+ *  (c) 2018 Marcel Kapfer <stuve.oeffentlichkeitsarbeit@uni-ulm.de>, Verfasste Studierendenschaft der Universität Ulm
+ *
+ *  All rights reserved
+ *
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *
+ *  This script is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Object\ObjectManager;
 use In2code\In2frontendauthentication\Domain\Repository\FeGroupsRepository;
 
+/**
+ * Add a custom groups slog
+ */
 class AddCustomGroupsSlot
 {