how to add custom additional password suggetions descriptions points in drupal 7?
Add this to your front-end theme's template.php file:

function THEME_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  switch($form_id) {
    case 'user_register_form':
    case 'user_profile_form':
      $form['account']['mail']['#description'] .= "And some additional stuff.";
          break;
  }
}


Add similar to admin theme if need be.

Clear the cache when you are done.

Alternatively try Better field descriptions.


  Better field descriptions makes it possible to add themeable
  descriptions to fields in forms.


I have never tried it but it looks like it could do the job, through just adding your own form_alter hook is much simpler.