Hook user and access callback

Hello, I am trying add a category in the user edit page and to restrict access to it:

if($op == 'categories'){
$data[] = array(
'name' => 'name',
'title' => 'The Title',
'access arguments' => array('perms required')
);
return $data;
}

It is supposed to appear only for the roles with 'perms required', but it does not appear to anyone.
If I remove the access arguments it works perfect.

I'm I on the right track?

Regards.

(edit the title said hook menu, I changed it)