As pointed out in #213, some settings are not yet documented.
I looked through the code and found these:

• settings.pypi.fallback - boolean - Always put PyPI last to prefere private repositories (defaults to true)
• settings.virtualenvs.create - boolean - Create a new virtualenv if one doesn't already exist (defaults to true?)
• settings.virtualenvs.in-project - boolean - Create the project's virtualenv inside the project's directory (defaults to false?)
• settings.virtualenvs.path - string - Directory where virtualenvs should be created (defaults to ~/.cache/pypoetry/virtualenvs?)
• repository.<name> - string - Additional repository's URL

Now, did I miss any? Are these defaults really the defaults? And where should it be documented? Here?

If we can agree on a way to present these informations, I'd be happy to work on a PR :)