svnserve access control

I am having trouble with access control under svnserve. I have a
project for which I want:
   anon-access = none
   one authenticated account with readonly access
   all other authenticated accounts with rw access

I created a "readonly" group in authz and added:
   [/]
   @readonly = r
But when I test as a member of the "readonly" group, I can still
commit changes back to the repository.

I am obviously not very talented with permissions. Could anyone help
get me pointed in the right direction?

Thanks,
Rich

-- 
Richard Greenwood
richard.greenwood@gmail.com
www.greenwoodmap.com
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