dired not bold enough to move directories

[Dan Jacobson]

Well, gosh, if I can move a directory like this,
  $ cd /var/tmp
  $ mv affordablehost_logs ~/tmp

then why can't I remame it with R in dired?
  Move `/var/tmp/affordablehost_logs' to 
`/home/jidanni/tmp/affordablehost_logs' failed:
  (file-error Non-regular file is a directory /var/tmp/affordablehost_logs)

  Move failed for 1 of 1 file
          Fri Feb  7 02:10:53 2003      Buffer `tmp'

OK, supposing that emacs has conscientious objections to doing this,
then right there on C-h k R it should say so.

What do I got to do to enable this, purchase the 'warez CD?
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