Issue with custom menu item

Hi Tom,

Please, custom menu item is not displaying in your secondary menu above the main menu.

I used this code:

function your_custom_menu_item ( $items, $args ) {
    if (is_single() ) {
        $items .= '<li>Show whatever</li>';
    }
    return $items;
}
add_filter( 'wp_nav_menu_items', 'your_custom_menu_item', 10, 2 );

In this case, Show whatever is my custom menu item.

Please, kindly assist

Regards,

Stardrive