Apple confirmed that a “Dark Mode” would be available to access inside its OS X Yosemite operating system during the WWDC keynote earlier this month, and now the feature can indeed be activated in Yosemite’s recently launched prerelease update.

The news comes from iOS developer Hamza Sood (@HamzaSood) (via MacRumors), who explains that users will need to navigate over to the Terminal and input the below command in order to activate a “somewhat functional” version of Dark Mode:

sudo defaults write /Library/Preferences/.GlobalPreferences AppleInterfaceTheme Dark

To return back to Yosemite’s usual appearance, a second Terminal code can be inputted (“To undo, either remove the key (defaults delete) or change it to ‘Light’,” Sood adds).

Unfortunately, though, even though we think Dark Mode would be a perfect fit for iOS, there’s still no mention of the feature reaching Apple’s mobile operating system. Alongside the Yosemite update Cupertino released iOS 8 beta 2, however a series of relatively minor alterations are the only notable additions to the software.

Besides its Dark Mode, Yosemite adds a new look, support for “Handoff” with iOS 8 devices, a revamped Safari app, a new Spotlight search feature, and much more.

The software update is expected to launch for the general public in fall this year. When it does, Yosemite will be available to download free of charge on the Mac App Store.