Add Extra Code to Primary Menu

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<?php
/**
 * Add Extra Code to Primary Menu
 * @author Bill Erickson
 * @link http://www.billerickson.net/customizing-wordpress-menus/
 *
 * @param string $menu
 * @param object $args
 * @return string modified menu
 */
function be_menu_extras($menu, $args) {
	$extras = '<li class="right">Your extras go here</li>';
	return $menu . $extras;
}
add_filter('wp_nav_menu_primary_items','be_menu_extras', 10, 2);