WordPress at a glance
action is not described

comment_form action-hook . WP 1.5.0

Fires at the bottom of the comment form, inside the closing </form> tag.


add_action( 'comment_form', 'action_function_name_9546' );
function action_function_name_9546( $post_id ){
	// action...
The post ID.

Where the hook is called

wp-includes/comment-template.php 2474
do_action( 'comment_form', $post_id );

Where the hook is used (in WP core)

wp-includes/default-filters.php 343
add_action( 'comment_form', 'wp_comment_form_unfiltered_html_nonce' );