Google has announced via a YouTube video that the major expansion of its Google Assistant across “eligible” Android Marshmallow and Nougat devices is kicking off today. The company first revealed plans to widely roll out Assistant during Mobile World Congress earlier this week. Android users in the United States will receive the update first, with Australia, Canada, the United Kingdom, and Germany to follow.

There’s no Google Assistant app to download or anything like that. Instead, Google is adding the functionality to “through an update to Google Play Services. So if you see that update pop up in the Google Play store, you’ll know you’re getting Assistant.

Google doesn’t have a list of those eligible devices, however; the company only promises that “hundreds of millions of Android users” will now be able to try Google Assistant instead of the voice search features that were in place before. It’ll likely feel very familiar to the old interface, though Assistant is slowly picking up new abilities and helpful tricks that weren’t there before. And now you’ve got the convenience of long-pressing the home button to activate Assistant.