WooCommerce Add Product Price Unit on Shop and Single Product Page

/**
* @Title: WooCommerce Add Product Price Unit on Shop and Single Product Page
* @Author: Mina Pansuriya
* @Website: http://minapansuriya.com
*/
add_filter( 'woocommerce_get_price_html', 'pbs_woo_add_product_unit_after_prie' );
add_filter( 'woocommerce_cart_item_price', 'pbs_woo_add_product_unit_after_prie' );

function pbs_woo_add_product_unit_after_prie( $price ) {
    
    $price .= ' per litre';
    return $price;
}