Twitter is working on a feature that will let you publish articles on the platform, according to owner Elon Musk. The feature will “allow users to post very long, complex articles with mixed media,” Musk said in a reply to a user tweeting about the in-development tool, which is apparently now called “Articles” instead of “Notes.” “You could publish a book if you want.”

The feature will further expand the ways you can write on the platform, which, under Musk’s ownership, is starting to move beyond its microblogging roots. Twitter Blue subscribers can already publish tweets with 10,000 characters, which is far above the 280-character limit imposed on non-Blue subscribers. Whenever the articles feature launches, it sounds like it will let you publish missives that are even longer.

Musk didn’t say when the articles feature might be released. But given Twitter’s recent history of surprise launches, I’m guessing it’ll just appear one day without much warning.