@sthulb yeah you might have to explain the `$: << File.expand_path('..', __FILE__)` a bit. 

So `__FILE__` returns the current file being executed.

`expand_path('..'` turns the current file into an absolute path (as far as I can see this makes the assumption that all files are one folder deep?)

But the `$: <<` I'm not sure about and couldn't find much useful info on