diff --git a/src/OpenConext/EngineBlock/Service/RequestAccessMailer.php b/src/OpenConext/EngineBlock/Service/RequestAccessMailer.php
index 77c572fe1..9eefed4a4 100644
--- a/src/OpenConext/EngineBlock/Service/RequestAccessMailer.php
+++ b/src/OpenConext/EngineBlock/Service/RequestAccessMailer.php
@@ -91,6 +91,8 @@ public function sendRequestAccessEmailForIdp($spName, $spEntityId, $institution,
             $comment
         );
 
+        // We use the destination email address also as a From since we do
+        // not have a better generic sender address available currently.
         $message = new Swift_Message();
         $message
             ->setSubject($subject)