diff --git a/usr.bin/man/man.sh b/usr.bin/man/man.sh
--- a/usr.bin/man/man.sh
+++ b/usr.bin/man/man.sh
@@ -909,6 +909,7 @@
 	*.gz)	cattool='/usr/bin/zcat' ;;
 	*.lzma)	cattool='/usr/bin/lzcat' ;;
 	*.xz)	cattool='/usr/bin/xzcat' ;;
+	*.zst)	cattool='/usr/bin/zstdcat' ;;
 	*)	cattool='/usr/bin/zcat -f' ;;
 	esac
 }