Twitter has added Debra Lee, the CEO of BET, to its board.
Twitter chair Omid Kordestani made the announcement via Twitter, of course.
And Lee followed up with her own Tweet:
Thrilled to be joining the @twitter board. It's transformed the media and the world like few other things in history (and continues to)!!— Debra Lee (@IamDebraLee) May 16, 2016
Lee's appointment is significant because, unlike other Twitter board members, she is an active Twitter user.
It's also significant because Lee, whose company is best known as the home of Black Entertainment Television, is a black woman joining a board that has been primarily composed of white men.
Last month, when Twitter announced the addition of new board members Hugh Johnston and Martha Lane Fox , Kordestani and Twitter CEO Jack Dorsey promised to make additional appointments that would diversify the board.
More additions to the board soon, ones that will bring diversity and represent the strong communities on Twitter. This matters & is a must.— Jack (@jack) April 8, 2016
Unlike Johnston and Fox, Lee won't be replacing any of Twitter's existing board members; instead, Twitter is simply increasing the size of its board.
Lee joined BET, now owned by Viacom, in 1986 and worked her way up the ladder, grabbing the top job in 2006.
This article originally appeared on Recode.net.