move/copy article with only one key

[Peter Gjefle]

(add-hook 'gnus-summary-mode-hook
          '(lambda ()
             (define-key gnus-summary-mode-map "i"
               'gnus-summary-copy-article "INBOX.copy")))

i've been trying the above, but gnus keeps asking where to move the
article.

 If TO-NEWSGROUP is string, do not prompt for a newsgroup to move to. 

the manual says the above.. how do i add the newsgroups so that i am not
prompted?

thanks for any pointers!
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