July 26th marked the 30th anniversary of the Americans with Disabilities Act, or the ADA. The ADA is a federal law that requires businesses, employers, public facilities, schools, and transportation agencies to make accommodations for disabled people, and helps weed out basic discrimination. When President George HW Bush signed the ADA into law in 1990, it was one of the most comprehensive pieces of civil rights legislation in American history.

But the disability rights movement didn’t begin or end with the ADA. In spite of the law’s existence, Americans with disabilities still face discrimination and other barriers to equal rights and opportunities.

Today, even though nearly 50 percent of Americans live with at least one disability, few know the history of the fight for disability rights. With Crip Camp, a new documentary on Netflix, filmmakers Jim LeBrecht and Nicole Newnham fill in some of that history through the personal and political stories that started the rise of a movement.