On the eve of the March For Our Lives demonstrations planned in Washington, D.C. and across the country, George Clooney penned a message thanking the students at Marjorie Stoneman Douglas High School in Parkland, Florida for what they “are doing to make the country a safer place.”

In a letter published in The Guardian newspaper in London, where three student journalists from Marjorie Stoneman’s award-winning Eagle Eye newspaper will edit the Guardian‘s coverage of the march Saturday in Washington, Clooney writes “Amal and I are 100% behind you and will be marching in DC on the 24th.” He adds, “We both feel very strongly that this is your march. Your moment. Young people are taking it to the adults and that has been your most effective tool.”

In February, George and Amal Clooney donated $500,000 to March For Our Lives – a sum later matched by Oprah Winfrey and others.

You can read Clooney’s letter in full below.