woocommerce_update_options_(id)_classes action-hook . WC 1.0

Usage

add_action( 'woocommerce_update_options_(id)_classes', 'action_function_name_6225' );
function action_function_name_6225(){
	// action...
}

Where the hook is called

do_action( 'woocommerce_update_options_' . $this->id . '_classes' );

Where in WP core the hook is used WooCommerce