A Chicago boy sent his mother a heart-warming message in a rather wintry way.

WGNTV, a news station in Chicago, reported the boy wrote “Hi Mom, God Bless U!” in the snow atop of a hospital structure. And the message is inspiring more than just the boy’s mother, who is in the hospital for acute myloid leukemia, or cancer of the blood, WGNTV reports. It’s had an impact on other hospital patients, who saw the message etched in the snow.

“And see it they did, patients, staff and visitors who looked south from up above, they all were touched by someone’s heartfelt message etched in the snow.”

See the message at wgntv.com.