Add wording before add to cart on products in WooCommerce on child sites.
Snippet Type
Execute on Child Sites
Snippet
add_action( 'woocommerce_before_add_to_cart_button', 'wc_before_add_to_cart_btn' );
function wc_before_add_to_cart_btn(){
echo 'Spend at least $20 to get free shipping';
}