gnus-parameters help? want to set a variable for one group

[google]

Hi--

My .gnus has:
(setq mm-inline-override-types
      '("text/html"
        "text/richtext"))

I want mm-inline-override-types to be nil for just one group.
I'd strongly prefer if it could be done in my .gnus.

I tried:
(setq gnus-parameters
  '((".*test.*"
     (mm-inline-override-types nil))))

but that didn't do it.

Help?

thanks for any clues!

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