When you head to the Settings app, choose “Privacy & Security” then tap “Journaling Suggestions,” you’ll see a “Discoverable by Others.” This is enabled by default, regardless of whether the aforementioned “Journaling Suggestions” feature is enabled. Apple says it “allows others to detect you are nearby to help prioritize their suggestions.”

The Discoverable by Others option, quietly enabled, allows other iPhone users with the Journal app to detect your iPhone via Bluetooth. Their Journal app uses that data to improve their Journal suggestions, as your Journal app will do for you when you get close to other iPhones in the wild.

If everyone leaves “discoverable by others” on, then each person’s phone will detect that two of your contacts are nearby and might later suggest you journal about bowling with friends, based on your location. Disabling the setting means you will not be included in your contacts’ counts of nearby people, according to Apple.