diff --git a/src/js/client.js b/src/js/client.js
index 26a89af1a..648c90a8b 100644
--- a/src/js/client.js
+++ b/src/js/client.js
@@ -2813,7 +2813,7 @@ angular.module('Application').service('Client', ['$http', '$interval', '$timeout
         get('/api/v1/mailserver/usage', config, function (error, data, status) {
             if (error) return callback(error);
             if (status !== 200) return callback(new ClientError(status, data));
-            callback(null, data.usage);
+            callback(null, data.usage); // { quotaValue (IEC/1024), quotaLimit (IEC/1024), quotaPercent }
         });
     };