Customers on social media have been furious with Chipotle for allegedly skimping on its burrito bowl portions this year. Now, the fast-casual chain’s CEO said the company is making changes.

Stock image of burritos resting on a plate. nerudol/Getty Images Where to Get Free Burritos on National Burrito Day. Many local chains are hosting promotions, including Chipotle, QDOBA, Moe's ...