diff --git a/src/Mailgun/Mailgun.php b/src/Mailgun/Mailgun.php
index 2dda1ee..561f607 100644
--- a/src/Mailgun/Mailgun.php
+++ b/src/Mailgun/Mailgun.php
@@ -104,6 +104,7 @@ class Mailgun
 
     /**
      * @param string $apiKey
+     * @param string $endpoint URL to mailgun servers
      *
      * @return Mailgun
      */