WhatsApp is owned by Facebook, recently renamed Meta Platforms.
With the update, users in Europe will view a banner notification that will take them to the new information.
Despite stressing that it disagreed with the decision of Ireland's Data Privacy Commission, the company said it had to comply by updating its policy while it is appealing.
The update does not affect users, who do not have to take any further action, or the handing of their data.
Because WhatsApp's regional headquarters is in Dublin, the Commission is the lead privacy regulator under European Union rules.
That update sparked a backlash from users who switched to rival services, such as Telegram and Signal, as well as an investigation by Turkey's competition watchdog, a temporary German ban on gathering data, and a complaint by EU consumer groups.