diff --git a/lib/libc/sys/chown.2 b/lib/libc/sys/chown.2
index 5518fadf766..c0b8dc8f558 100644
--- a/lib/libc/sys/chown.2
+++ b/lib/libc/sys/chown.2
@@ -121,7 +121,7 @@ Too many symbolic links were encountered in translating the pathname.
 The operation would change the ownership, but the effective user ID is not the
 super-user.
 .It Bq Er EPERM
-The named file has its immutable flag set, see the
+The named file has its immutable or append-only flag set, see the
 .Xr chflags 2
 manual page for more information.
 .It Bq Er EROFS