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 # Formula Cookbook
 
-A formula is a package definition written in Ruby. It can be created with `brew create $URL`, installed with `brew install $FORMULA`, and debugged with `brew install --debug --verbose $FORMULA`. Formulae use the [Formula API](http://www.rubydoc.info/github/Homebrew/brew/master/Formula) which provides various Homebrew-specific helpers.
+A formula is a package definition written in Ruby. It can be created with `brew create $URL` where `$URL` is a zip or tarball, installed with `brew install $FORMULA`, and debugged with `brew install --debug --verbose $FORMULA`. Formulae use the [Formula API](http://www.rubydoc.info/github/Homebrew/brew/master/Formula) which provides various Homebrew-specific helpers.
 
 ## Homebrew Terminology