':calls: `PUT /user/following/:user <http://developer.github.com/v3/users/followers>`_
:param following: :class:`github.NamedUser.NamedUser`
:rtype: None'

def add_to_following(self, following):

    assert isinstance(following, github.NamedUser.NamedUser), following
    (headers, data) = self._requester.requestJsonAndCheck('PUT', ('/user/following/' + following._identity))
