diff --git a/lib/restbase.js b/lib/restbase.js
index <HASH>..<HASH> 100644
--- a/lib/restbase.js
+++ b/lib/restbase.js
@@ -63,8 +63,8 @@ RESTBase.prototype.request = function (req) {
         return Promise.reject(new HTTPError({
             status: 403,
             body: {
-                type: 'access_denied',
-                title: 'Access denied'
+                type: 'access_denied#sys',
+                title: 'Access to the /{domain}/sys/ hierarchy is restricted to system users.'
             }
         }));
     }
Add information when denying access to sys