diff --git a/administrator/modules/mod_mip_darkmode_switch/tmpl/default.php b/administrator/modules/mod_mip_darkmode_switch/tmpl/default.php
index 176e1f9..79380e2 100644
--- a/administrator/modules/mod_mip_darkmode_switch/tmpl/default.php
+++ b/administrator/modules/mod_mip_darkmode_switch/tmpl/default.php
@@ -6,6 +6,7 @@
  *
  * @copyright   (C) 2024 Mahmudul Islam Prakash <prakash.a7x@gmail.com>
  * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ * Reference link https://it-networks.de/dev-blog/tutorial-joomla-5-dark-mode-switcher-modul-erstellen-backend
  */
 
 defined('_JEXEC') or die;