diff --git a/scripts/pi-hole/js/ip-address-sorting.js b/scripts/pi-hole/js/ip-address-sorting.js
index 42f05cba..6ef1fd3d 100644
--- a/scripts/pi-hole/js/ip-address-sorting.js
+++ b/scripts/pi-hole/js/ip-address-sorting.js
@@ -4,6 +4,9 @@
 *
 *  This file is copyright under the latest version of the EUPL.
 *  Please see LICENSE file for your rights under this license.  */
+
+// This code has been taken from
+// https://datatables.net/plug-ins/sorting/ip-address
 jQuery.extend( jQuery.fn.dataTableExt.oSort,
 {
     "ip-address-pre": function ( a )