diff --git a/lib/CalDAV/Schedule/IMipPlugin.php b/lib/CalDAV/Schedule/IMipPlugin.php
index e413b798b3..4602c3ec55 100644
--- a/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/lib/CalDAV/Schedule/IMipPlugin.php
@@ -35,6 +35,8 @@ class IMipPlugin extends DAV\ServerPlugin
 
     /**
      * Creates the email handler.
+     *
+     * @param string $senderEmail
      */
     public function __construct($senderEmail)
     {