Dark modes are a popular addition to apps nowadays, letting you save your eyes from being blinded by a bright white screen while also helping to save a little battery life on OLED screens. Now another major app has gotten a dark mode.

Facebook Messenger now has a dark mode, but it's a bit hidden. To get it, you'll need to send the crescent moon emoji in any Messenger chat. You'll then see a bunch of moons falling across your screen and a pop-up telling you that you've found dark mode. You can enable dark mode in your Messenger app's settings.

"Messenger’s dark mode provides lower brightness while maintaining contrast and vibrancy," explains Bridget Pujals, Product Manager for the Messenger team. "Dark mode cuts down the glare from your phone for use in low light situations, so you can use the Messenger features you love no matter when or where you are."

This new dark mode takes a little getting used to after getting accustomed to Facebook Messenger's bright white UI, but it's a welcome addition that'll help save your eyes if you're chatting late at night.  Facebook Messenger's dark mode is available to all users on Android and iOS. Facebook says the feature will be fully rolled out in Messenger's settings in the coming weeks.