Signal uses phone numbers as addresses you can reach people at. When a phone number in your contacts signs up for Signal, you’ll see a notification telling you they’re reachable on Signal. The name associated with that person comes from the contact information saved on your phone.

To hide these alerts, open the Signal app on your iPhone or Android phone. Tap your profile picture or username initials shown at the top-left corner of the Signal conversation list.

Tap “Notifications” on the Signal settings menu screen.

Under Events, tap the slider to the right of “Contact Joined Signal” to disable these contact-join notifications.

That’s it—Signal won’t let you know when your friends, family members, coworkers, or other contacts join in the future. The Signal app will still know, of course. If you tap the “New Message” icon, you’ll see all your contacts who are on Signal, ready to be contacted.