WooCommerce Checkout Order Notes Placeholder

gistfile1.txt

/*-----------------------------------------------------------------------------------*/
/*	WooCommerce - Change Order Notes Placeholder Text 
/*-----------------------------------------------------------------------------------*/

add_filter( 'woocommerce_checkout_fields', 'theme_woocommerce_checkout_fields' );

function theme_woocommerce_checkout_fields( $fields ) {

	$fields['order']['order_comments']['placeholder'] = 'Add your custom message here';
	return $fields;
}