The U.S. Postal Service opened up its annual Operation Santa letter adoptions earlier than it ever this year, and you can help Santa make holiday wishes come true for families facing a challenging holiday season.

The 111-year-old Operation Santa program handles letters addressed to Santa at the North Pole. The postal service makes it possible for people to adopt and respond to the letters, giving children across the country a bit of hope that their holiday wishes are being heard – and even fulfilled.

Operation Santa began accepting letters this year in mid-September. Here’s what you need to know.

Santa letters must include the writer’s first and last name and a complete return address. The envelope must have a postage stamp and be addressed to Santa, 123 Elf Road, North Pole, 88888.

The letters are opened at Santa’s mailroom, personal information is redacted, and the letters are uploaded onto the USPS website. Writers don’t need to register online; all letters must be postmarked by Dec. 11.

If you want to help fulfill these holiday wishes, people can adopt letters through the online channel at USPSOperationSanta.com.