When the contract includes an express possibility of price revision, within the limits provided for in article L. 211-12, it shall mention the precise methods of calculation, both upwards and downwards, of price variations, in particular the amount of transport costs and related taxes, the currency or currencies which may have an impact on the price of the trip or holiday, the proportion of the price to which the variation applies, as well as the rate of the currency or currencies used as a reference when establishing the price appearing in the contract.
In the event of a price reduction, the organiser or retailer has the right to deduct its actual administrative expenses from the refund due to the traveller. At the request of the traveller, the organiser or retailer shall provide proof of these administrative expenses.