EDD Add Categories/Tags to [downloads] shortcode in custom function

gistfile1.php

<?php
/*
 * Use "download_category" for categories and "download_tag" for tags
 */
function custom_display_download_cats() {
    the_terms( $post->ID, 'download_category', '<span class="download-categories-title">Categories:</span> ', ', ', '' );
}
add_action( 'edd_download_after', 'custom_display_download_cats' );