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// Add text to settings page for quick reference
function general_admin_notice(){
    global $pagenow;
    if ( $pagenow == 'nav-menus.php' ) {
         echo '<div class="notice notice-info">
             <p>Use the following classes are to change the appearance of sub menu items.</p>
      			 <ul>
        			 <li>feature--transparent = transparent</li>
        			 <li>feature--white = white</li>
        			 <li>feature--blue = blue</i>
        			 <li><i>no class added = displays feature image if exists</i></li>
             </ul> 
         </div>';
    }
}
add_action('admin_notices', 'general_admin_notice');