Wordpress. Adding menu item manually in wp_nav_menu

Question

In my theme there is a function for nav menus

function ct_nav() {
  <nav>
     <?php wp_nav_menu( array( 'container_id' => 'nav', 'theme_location' => 'primary') ); ?>
  </nav>
}

How could i add more item manually? using this function alone.

Answer 1

function add_last_nav_item($items) {
  return $items .= '<li><a href="#myModal" role="button" data-toggle="modal">Contact</a></li>';
}
add_filter('wp_nav_menu_items','add_last_nav_item');