diff --git a/app/devices/device_edit.php b/app/devices/device_edit.php
index 2fb8c0f6d3..1e15518d62 100644
--- a/app/devices/device_edit.php
+++ b/app/devices/device_edit.php
@@ -381,6 +381,7 @@ require_once "resources/require.php";
 			obj[0].parentNode.removeChild(obj[2]);
 		}
 
+	// checks for duplicate devices (mac addresses) in db
 		function check_mac_duplicate(mac_addr, device_uuid_to_ignore) {
 			if (mac_addr != '') {
 				check_url = "device_edit.php?mac="+mac_addr+"&id="+device_uuid_to_ignore;