The Galaxy S8 and S8+ are notable smartphones for many reasons, one of which is that they’re Samsung’s first flagships to have on-screen navigation buttons. Now it’s been revealed that Samsung cooked up something special for those buttons.

Samsung has made it so that the Galaxy S8’s on-screen home button moves ever so slightly from time to time. This is likely to prevent burn-in, something that used to affect older CRT computer monitors and can still affect OLED screens like the one found on the Galaxy S8.

You’re probably not going to notice the movement in your day-to-day usage, but if you use paper or something else to physically mark where the button is, you can see that the button moves. This is how the folks at GalaxyClub confirmed that the home button moves.

Samsung’s Galaxy S8 isn’t the first mobile device to have a burn-in prevention feature, as Android Wear as a Display Burn-in Prevent feature so that watch faces don’t get burned into your wearable’s display. That doesn’t change the fact that this is a smart inclusion by Samsung, though. The Galaxy S8 is a flagship device, and I’m sure a lot of owners would be frustrated if they discovered that their phone had a home button icon burned into their screen.