Don't show related posts at end of youtube videos

I added this filter to my theme’s functions.php:

/** change the YITH WooCommerce Featured Video embed string to include rel=0 */
add_filter('woocommerce_single_product_image_html', 'add_yt_rel', 30, 1);
function add_yt_rel($text) {
	$return = str_replace('wmode=transparent', 'wmode=transparent&rel=0', $text);
	return $return;
}