没有可用的操作和筛选器挂钩来修改分类法元框html，如admin\\u post\\u thumbnail\\u html。所以这里有一个技巧，可以在类别下面添加描述。您必须创建新的metabox以获取帮助，然后移动到category div。

# Add new meta box for help description
add_action( \'add_meta_boxes\', \'add_help_desc_meta_box\', 0 );
function add_help_desc_meta_box() {
    global $wp_meta_boxes;
    add_meta_box(\'description-help-desc-meta-box\',__(\'Categories Help Description\'),\'description_meta_box_callback\',\'post\',\'side\',\'low\');
}

# here you can add your description
function description_meta_box_callback()
{
    echo "<p>Here is your description</p>";
}


#you can append your help desc meta box to category
function cat_help_description_meta_box_move() {
    ?>
    <script>
        (function($) {
            $(function(){
                $(\'#description-help-desc-meta-box\').find(\'.inside\').appendTo(\'#categorydiv\').end().end().remove();
            });
        })(jQuery);
    </script>
    <?php
}
add_action( \'admin_head\', \'cat_help_description_meta_box_move\' );