If end-users that are natural persons give their consent to their data being included in such directories, they should be able to determine on a consent basis which categories of personal data are included in the directory (for example name, email address, home address, user name, phone number). In addition, providers of publicly available directories should inform the end-users of the purposes of the directory and of the search functions of the directory before including them in that directory. End-users should be able to determine by consent on the basis of which categories of personal data their contact details can be searched. The categories of personal data included in the directory and the categories of personal data on the basis of which the end-user's contact details can be searched should not necessarily be the same.