CakePHP adding atom:link to channel using RSS Helper

cakephp atom link

$this->set('documentData', array('xmlns:dc' => 'http://purl.org/dc/elements/1.1/', 'xmlns:atom' => 'http://www.w3.org/2005/Atom'));

$this->set('channelData', array(
  'title' => __("Comercio Exterior", true),
	'link' => 'http://www.aduanacol.com/news.rss',
	'description' => __("Noticias más recientes de comercio exterior Colombiano.", true),
	'language' => 'es-co',
	'atom:link' => array(
		'attrib' => array(
			'href' => 'http://www.aduanacol.com/news.rss',
			'rel' => 'self',
			'type' => 'application/rss+xml'
		)
	)
));

Thanks ! It works very well.

And you can just replace
'href' => 'http://www.aduanacol.com/news.rss',
with
'href' => $this->Html->url('/news.rss', true),