You know the ads that you see for apps above search results on the App Store? Apple started rolling out App Store search ads two years ago, and now at least one analyst believes the feature could be a $2 billion business all on its own in two years.

Bernstein analyst Toni Sacconaghi published the prediction in a research note shared by CNBC today:

Sacconaghi’s estimate is based in part on his forecast that Apple will make some $500 million this year on selling search ads on the App Store this year alone. The analyst compares the possible size of Apple’s search ads business in 2020 to that of Apple Music last year.

Search ads were initially introduced in North America in 2016 and expanded internationally last year in the UK, Australia, and New Zealand. More countries across Europe and Asia have gained search ads this year as well.

Earlier this year, it was reported by The Wall Street Journal that Apple was considering expanding search ad results from the App Store to search ad results within apps like Snapchat and Pinterest.

Apple has increased its focus on new ways to generate revenue through its Services division with products like Apple Music, subscriptions and search ads on the App Store, and a new video service based on original content in the works for debut next year.

Apple is scheduled to share its latest earnings results next Friday on November 1 following its second fall event on October 30th where new Mac and iPad Pro hardware is expected.