hd => domain.com is not working…

On this page
http://hybridauth.sourceforge.net/userguide/IDProvider_info_Google.html
developers wrote, that “hd” => “domain.com” would prevent registration from the other than this domains. I’ve added this parameter to /wp-content/plugins/socialauth-wp/hybridauth/config.php

No luck… All are able to register. From gmail.com, etc. Why is not working?
It looks like this by the moment:

“Google” => array (
“enabled” => true,
“keys” => array ( “id” => “”, “secret” => “” ),
“scope” => “”,
“hd” => “neededdomain.com”
),

Sincerely,
Pavel.

http://wordpress.org/extend/plugins/socialauth-wp/