diff --git a/Configuration/Icons.php b/Configuration/Icons.php
index 7e16c3f8..ccc49b90 100644
--- a/Configuration/Icons.php
+++ b/Configuration/Icons.php
@@ -1,5 +1,12 @@
 <?php
 
+/*
+ * This file is part of the package jweiland/reserve.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE file that was distributed with this source code.
+ */
+
 use TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider;
 
 $iconsRegistered = [
@@ -9,6 +16,7 @@
     ],
 ];
 
+// register icons for model TCA tables
 $modelIcons = ['facility', 'order', 'order_1', 'period', 'reservation', 'email'];
 foreach ($modelIcons as $modelIcon) {
     $identifier = 'tx_reserve_domain_model_' . $modelIcon;