-only the super-user can set file ownership. Note that if the remote system
-is a daemon using chroot, the --numeric-ids option is implied because the
-remote system cannot get access to the usernames from /etc/passwd.
+only the super-user can set file ownership. The preservation is done
+primarily by name, but falls back to using the ID number if the ID has
+no name on the sending side or has no match on the receiving side.
+See also the --numeric-ids option and the "use chroot" setting in the
+rsyncd.conf manpage.