Ever wish you could just press a button and your airplane seat would become instantly less confining? Well, you can. Kind of.

Where is this magical button, you ask? On the underside of the outer most armrest of the aisle seat (sorry, window seat-lovers, but you do get to rest your head against the window). To find it, slide your hand under the armrest, close to the hinge and feel for the button. Press it and you are now free to move that armrest up so it’s flush with the back of your seat, giving you the freedom you deserve. A simple move with a big reward: no more armrest digging into your side and a little swing room for your legs.

It’s also a helpful trick to use at the end of your flight when you need more space to stand up and grab your luggage from the overhead bin. Instead of doing that awkward, half-backbend lean to grab your bag from above you, while also trying to avoid touching your neighbor, just put up the armrest and easily get out of your seat.

But, that’s not all this button was intended for. While it does provide some much-needed relief from the constricting boundaries of an airplane seat, its sole function isn’t to give you more room. It’s actually a safety measure to allow a quick and easy escape should you need to make an emergency exit from the plane.