Wordpress: "More From Author" to Feed

gistfile1.aw

<?php
function authors_post_list_in_feed($content) {
	if(is_feed()) {
		global $post;
		$author = get_the_author();
		$author_id = $post->post_author;
		$the_posts = get_posts('author=' . $author_id . '&numberposts=5');
		$output = '<h3>More From ' . $author . '</h3>';
		$output .= '<ul>';
		foreach($the_posts as $post) {
			$permalink = get_permalink();
			$title = get_the_title();
			$output .= '<li><a href="' . $permalink . '">' . $title . '</a></li>';
		}
		wp_reset_query();
		$output .= '</ul>';
		$content = $content.$output;
	}
	return $content;
}
add_filter('the_content','authors_post_list_in_feed');
?>