Woocommerce quantity suffix php snippet

This code snippet adds a custom text "kg" after the quantity input field in WooCommerce product pages by utilizing the woocommerce_after_quantity_input_field action hook. 
It goes into the functions.php file of your theme.

add_action( 'woocommerce_after_quantity_input_field', 'qty_add_cart' );

  

function qty_add_cart() {

   echo '<span class="qty-suff">kg</span>';

}