Billionaire Elon Musk will join Twitter‘s board of directors, the company announced Tuesday, a day after disclosing that the Tesla CEO took a 9% stake in the social media company.

Twitter said in a regulatory filing Tuesday that Musk would get a seat on its board, with the term expiring in 2024, and that he wouldn’t be allowed to own more than 14.9% of its stock as long as he’s a board member and for 90 days after.