Wordpress: remove 'website' field from comment form

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/* Remove 'website' field for comment form *****************************************************************
** http://techhacking.com/2011/02/04/wordpress-how-to-remove-the-website-field-from-the-comment-form/ ** **/
/* !댓글폼에서 웹싸이트 필드 제거 ***************************************************************************** */
add_filter('comment_form_default_fields', 'url_filtered');
function url_filtered($fields) {
	if(isset($fields['url']))
	unset($fields['url']);
	return $fields;
}