The government has announced that some secondary school pupils in England will have to wear face coverings or masks in classrooms for an initial period when they return to school.
It's a big change as previously students only had to wear them in communal areas and some children don't have to wear them at all.
The Secretary of State for Education, Gavin Williamson, has said that the plan for children to wear masks in class will be reviewed after the first few weeks of school.
"We're reviewing that at the Easter holidays to see if that has had a positive impact... or whether it's going to continue to be necessary."
He didn't rule out that the policy could be in place
until 21 June, the final date in the plan to ease the lockdown.