WooCommerce make order notes required in checkout

woocommerce-make-order-notes-required-in-checkout.php

/**
 * Make order notes required
 */
add_filter( 'woocommerce_checkout_fields' , 'dev_woocommerce_make_order_comments_required' );
function dev_woocommerce_make_order_comments_required( $fields ) {
	$fields['order']['order_comments']['required'] = true;
	return $fields;
}

// add_action( 'woocommerce_after_checkout_validation', 'dev_woocommerce_add_notice_for_empty_order_comments' );
// function dev_woocommerce_add_notice_for_empty_order_comments() {
//     // Check if set, if its not set add an error.
// 	if ( ! $_POST['order_comments'] ) {
// 		wc_add_notice( __( 'Please enter order notes.' ), 'error' );
// 	}
// }