I found this in the raw category template in the woocommerce files.
<?php
/**
* The template for displaying product category thumbnails within loops
*
* This template can be overridden by copying it to yourtheme/woocommerce/content-product_cat.php.
*
* HOWEVER, on occasion WooCommerce will need to update template files and you
* (the theme developer) will need to copy the new files to your theme to
* maintain compatibility. We try to do this as little as possible, but it does
* happen. When this occurs the version of the template file will be bumped and
* the readme will list any important changes.
*
* @see https://docs.woocommerce.com/document/template-structure/
* @author WooThemes
* @package WooCommerce/Templates
* @version 2.6.1
*/
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
?>
<li <?php wc_product_cat_class( '', $category ); ?>>
<?php
/**
* woocommerce_before_subcategory hook.
*
* @hooked woocommerce_template_loop_category_link_open - 10
*/
do_action( 'woocommerce_before_subcategory', $category );
/**
* woocommerce_before_subcategory_title hook.
*
* @hooked woocommerce_subcategory_thumbnail - 10
*/
do_action( 'woocommerce_before_subcategory_title', $category );
/**
* woocommerce_shop_loop_subcategory_title hook.
*
* @hooked woocommerce_template_loop_category_title - 10
*/
do_action( 'woocommerce_shop_loop_subcategory_title', $category );
/**
* woocommerce_after_subcategory_title hook.
*/
do_action( 'woocommerce_after_subcategory_title', $category );
/**
* woocommerce_after_subcategory hook.
*
* @hooked woocommerce_template_loop_category_link_close - 10
*/
do_action( 'woocommerce_after_subcategory', $category ); ?>
</li>