Under their Pearl Street Films banner, Affleck and Damon have produced films such as Manchester By the Sea, Jason Bourne, and Live By Night, among other features and television series, and are now working on Matt Reeves' The Batman (with Affleck still set to star as the Caped Crusader) and Affleck's remake of Witness for the Prosecution.
The clause can be added to any contract to ensure that the project provides for gender and racial diversity.
In a speech at the Oscars, Frances McDormand made mention of the inclusion rider.
"We all have stories to tell and we need finance", McDormand said. "Don't talk to us about it at the parties... invite us into your office in a couple of days or you can come to ours, whichever suits you best, and we'll tell you all about them", she announced.
The heightened buzz prompted the Annenberg Inclusion Initiative, founded by University of Southern California professor Stacy Smith, who floated the idea of inclusion riders in 2016, to tweet out a quick explainer on the term.
"I have two words to leave with you tonight, ladies and gentlemen: inclusion rider", she said. It requires cast and crew on a film to meet a certain level of diversity, and is a solid commitment to increasing representation of women and minorities in the industry.