(13)Competent authorities in host Member States do not scrutinise prospectuses. Therefore, to ensure that investors in host Member States are adequately protected, when the competent authority of the host Member State seeks the assistance of the competent authority in the home Member State, it should communicate the information that is relevant for the competent authority in the home Member State to assess the consistency of the advertisement with the content of the prospectus. Such communication should occur within the appropriate timeframe to ensure that investors in host Member States are not penalised by the fact that host competent authorities do not scrutinise prospectuses and have sufficient time to analyse the underlying public offering. The competent authority in the host Member State should be informed to the degree necessary to exercise control over the compliance of advertising activity in its jurisdiction.