It means that you can run coffee yourprogram.litcoffee and it will run the CoffeeScript program in your document. On the other hand, you can run the file t

It means that you can run coffee yourprogram.litcoffee and it will run the CoffeeScript program in your document. On the other hand, you can run the file through your favorite Markdown viewer/processor and you'll see a nicely formatted version of the whole file with comments included. In other words, it is both valid (Literate) CoffeeScript and valid Markdown.