Spotify has added another subscription option. This time around, it’s offering a plan that has little to do with music. The Audiobooks Access Tier (which is US-only for now) offers 15 hours of audiobook listening each month for $10. You’ll have access to Spotify’s library of more than 200,000 titles You can, of course, still listen to ad-supported music via Spotfy’s free tier.

At first glance, it might seem odd for Spotify to offer an audiobook-only tier at this price. Spotify Premium, which costs $11 per month, has the same 15 hours of audiobook listening time as well as other perks. However, audiobooks often take somewhere in the realm of between seven and 11 hours to listen to.

As such, Spotify is undercutting Audible to a degree. That platform offers one audiobook credit per month for $15. So, for $5 less with Spotify, you might be able to listen to roughly two books per month (unless you prefer to enjoy epic novels that are around 1,000-plus pages long in print). It’s worth bearing in mind, though, that unused listening time does not carry over into the next month.

Spotify noted that, since it started offering 15 hours of audiobook listening to Premium subscribers at no extra cost in November, there’s been a 45 percent increase in those on the free tier searching for and interacting with audiobook material every day (the company also sells audiobooks on its web player). That uptick in interest is a decent enough reason for Spotify to try an audiobook-only subscription tier.