(26)Key information, for example on the main characteristics of the travel services or the prices, provided in advertisements, on the organiser's website or in brochures as part of the pre-contractual information, should be binding, unless the organiser reserves the right to make changes to those elements and unless such changes are clearly, comprehensibly and prominently communicated to the traveller before the conclusion of the package travel contract. However, in the light of new communication technologies, which easily allow updates, there is no longer any need to lay down specific rules on brochures, while it is appropriate to ensure that, changes to pre-contractual information are communicated to the traveller. It should always be possible to make changes to pre-contractual information where expressly agreed by both parties to the package travel contract.