Code-Snippets-Functions/Execute a function on a child site/WooCommerce/change-placeholder-text-in-additional-notes-checkout.txt

add_filter( 'woocommerce_checkout_fields' , 'wc_custom_additional_info' );
// Change placeholder text in Additional Notes
function wc_custom_additional_info( $fields ) {
     $fields['order']['order_comments']['placeholder'] = 'Add a Shipping address here if different from Billing Address, or any additional notes for delivery';
     return $fields;
}