wordpress woocommerce out of stock

woocommerce.php

// Woo commerce change out of stock text
add_filter('woocommerce_get_availability', 'availability_filter_func');

function availability_filter_func($availability)
{
$availability['availability'] = str_ireplace('Out of stock', 'This item is currently out of stock.  Please check back again at a later date.', $availability['availability']);
return $availability;
}