One of the biggest changes in iOS 15.4 is support for using Face ID while wearing a mask. Apple explains that it is scanning the “unique features around the eye area” to authenticate you with Face ID while wearing a mask.

Once you install iOS 15.4, you’ll be guided through a new set up process for using Face ID with a mask. Apple notes that Face ID is “most accurate when it’s set up for full-face recognition only.” With that in mind, however, you have the option of using Face ID with a mask anyways.

The “Use Face ID with a Mask” feature is available on the iPhone 12 mini, iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max and the iPhone 13 mini, iPhone 13, iPhone 13 Pro, and iPhone 13 Pro Max.

iOS 15.4 and iPadOS 15.4 are rolling out now as over-the-air updates to all iPhone and iPad users. You can update your devices by going to the Settings application, choosing General, then choosing Software Update.