Question

I would like to additional instructions to a custom Drupal form, similar to hook_help, but at the bottom of the form. Is there a function or hook available for this?

Answer 1

If you add an element to the form with no type, its’ value will be displayed as HTML on the page.

See here

$form['contact_information'] = array(
  '#value' => t('You can leave us a message using the contact form below.'),
);