[racket] pkg/info.rkt documentation

I'm feeling a bit dense and/or blind. Is there documentation for the 
info.rkt format that raco pkg expects? I managed to make something that 
works by cribbing off of an existing package, but I'm not sure what 
(define collection 'multi) means (or what the alternative is), nor how 
to figure out what should go in deps beyond "base". Did I miss a "pkg 
for dummies" document?
-- 
Brian Mastenbrook
brian at mastenbrook.net
http://brian.mastenbrook.net