Module admin page link doesn't display on /admin page.

My module's admin page is working correctly when you navigate to it by entering "/admin/settings/my_module", but does not appear in the master list of module settings on the admin page. I figure I am overlooking something simple, but am having difficulty locating the problem.

The link registration in my_module_menu looks like this:

    $items['admin/settings/my_module'] = array(
      'title' => 'Administer My Module',
      'description' => 'Admin for My Module',
      'page callback' => 'admin_my_module',
      'access arguments' => array('administer my module'),
      'type' => MENU_CALLBACK,
    );

Any ideas?