comment_form_before action-hook . WP 3.0.0
Fires before the comment form.
Usage
add_action( 'comment_form_before', 'action_function_name_356' );
function action_function_name_356(){
// action...
}Where the hook is called
comment_form_before
wp-includes/comment-template.php 2296
do_action( 'comment_form_before' );