diff --git a/authentication.php b/authentication.php
index dfa4174..66be594 100644
--- a/authentication.php
+++ b/authentication.php
@@ -296,6 +296,7 @@ class authentication
   // }}}
 
   /** Return the JSON Web Token
+    * @param string $email The user email to store in JSON Web Token payload
     */
   public function createJwtToken ($email)
   // {{{