Is there a filter/action to add content to WP admin metaboxes?

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I want to add an instruction into a custom term meta-box.
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Is there a hook to add this or is it easiest just to use JavaScript?

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  1. I couldn’t find a hook so I went with the JS option.

    add_action( "admin_head-post-new.php", 'meta_box_instruction' ); //new post
add_action( "admin_head-post.php", 'meta_box_instruction' );    //edit post
function meta_box_instruction($d) { 
global $post;

    if($post->post_type == '{YOUR POST TYPE}' || $_GET['post_type'] == '{YOUR POST TYPE}'):
    ?>

    <script type='text/javascript'>
        jQuery(document).ready(function(){
            jQuery('<p>Some instruction</p>').insertBefore('#taxonomy-{YOUR TAXONOMY NAME}').parent();
        });
    </script>

    <?php
    endif;
}