To improve usability, I wanted to add a note to the bottom of my form to show that an asterisk indicates a required form field. In this case, I am modifying the user registration form, but the code can be simplified to work with any form API.
<?php
function MYMODULE_form_alter($form_id, &$form) {
// ...code...
if ($form_id == 'user_register') {
$form['requiredNote'] = array(
'#value' => "
<div class='form-item'>
<label>
<span class='form-required'>*</span> Indicates Required Field
</label>
</div>",
'#weight' => 10,
);
}
// ...code...
}
?>