default editor label for my_custom_post_type

functions.php

<?php

// default editor label for my_custom_post_type
add_action('admin_footer', 'add_title_to_editor');

function add_title_to_editor() {
    global $post;
    if (get_post_type($post) == 'my_custom_post_type') : ?>
        <script> jQuery('<h3>Optional Additional Information</h3>').insertBefore('#postdivrich'); </script>
    <? endif;
}