diff --git a/callback.php b/callback.php
index 9479e5b..017cf39 100644
--- a/callback.php
+++ b/callback.php
@@ -93,6 +93,7 @@
     die('FAIL. Invoice not paid.');
 }
 
+// Deliver order.
 helper::deliver_order($component, $paymentarea, $itemid, $paymentid, $userid);
 
 // Notify user.