gistfile1.php

<?php 
function woocommerce_free_delivery_fragment( $fragments ) {
	
	global $woocommerce;
 
	ob_start(); ?>

	  <div class="promo">Show Promo Area</div>
 
	<?php 

	$fragments['div.promo'] = ob_get_clean();
 
	return $fragments;
 
}
add_filter('add_to_cart_fragments', 'woocommerce_free_delivery_fragment');