Craig Newmark, most widely known as the founder of Craigslist, has donated $1 million to The Poynter Institute. It’s the single largest donation in Poynter’s 41-year history.

The donation will be used to fund a large-scale, five-year program that focuses on fact-checking, accountability and ethics in journalism. The program will be overseen by Poynter’s new Craig Newmark Chair in Journalism Ethics. Poynter expects to make this chair a permanent role.

“I want to stand up for trustworthy journalism, and I want to stand against deceptive and fake news,” said Newmark, in an announcement. “And I want to help news organizations stand and work together to protect themselves and the public against deception by the fake media.