The Centers for Disease Control and Prevention recently released long-awaited guidance on reopening schools that were closed in response to the coronavirus.

The recommendations, which are voluntary, gave some parents and teachers their first detailed glimpse of how schools might change their operations to slow the spread of COVID-19. Among the highlights, they call for adults to wear masks and recommend them for students in areas where social distancing isn’t possible. They also call for students to stay in small classroom cohorts throughout the day, for buses to operate at partial capacity, and for cafeterias to remain closed.

How much these recommendations influence schools’ operations will depend on the decisions of state and local leaders. Watch the video above for an explanation of some key points.