T-Mobile has begun rolling out its Android 5.1.1 update for the Nexus 6. The release was finally approved by Google just two days ago, and it brings Wi-Fi calling as well as plenty of bug fixes.

Des Smith, Product Evangelist at T-Mobile, confirmed the update’s approval on Twitter, promising that “a small group” of Nexus 6 owners would receive the release over-the-air this weekend. It will come with build number LYZ28E, and it weighs in at 125MB.

“If all goes well,” T-Mobile will continue to make Android 5.1.1 available to more Nexus 6 owners “over the coming weeks,” Smith added.

In addition to Wi-Fi calling, Android 5.1.1 for the Nexus 6 brings a number of bug fixes and performance improvements, including a patch for one issue that caused handsets to run slowly with encryption enabled.

You will need to be running Android 5.1 to get the Android 5.1.1 release, so if you haven’t already installed that yet, it might be a good idea to do so soon. If you’re still waiting for Android 5.1 to reach you, you may prefer to download the firmware package from Google and flash it manually.