Custom post types and commenting

Hello,

I’m using custom post types in my WordPress installation. Works pretty nice, but I have one problem.

When adding ‘comments’ to the register function, the “comments” checkbox appears but is unchecked by default. Is there a way to make this checked?

add_action('init', 'reg_projecten'); // projecten
function reg_projecten() {
	$labels = array(
		'name' => _x('Projecten', 'post type general name'),
		'singular_name' => _x('Project', 'post type singular name'),
		'add_new' => _x('Voeg toe', 'portfolio item'),
		'add_new_item' => __('Voeg nieuw project toe'),
		'edit_item' => __('Pas project aan'),
		'new_item' => __('Nieuwe project'),
		'view_item' => __('Bekijk project'),
		'search_items' => __("Zoeken naar projecten."),
		'not_found' =>  __('Geen projecten gevonden.'),
		'not_found_in_trash' => __('Geen projecten gevonden in de prullenbak.'),
		'parent_item_colon' => ''
	);
	$args = array(
		'labels' => $labels,
		'public' => true,
		'publicly_queryable' => true,
		'show_ui' => true,
		'query_var' => true,
		'rewrite' => true,
		'capability_type' => 'post',
		'hierarchical' => false,
		'menu_position' => null,
		'supports' => array('title','editor','thumbnail','comments'),
		'taxonomies' => array('category', 'post_tag')
	);
	register_post_type( 'projecten' , $args );
}

Hoping for help! Thanks