def add_entry_point(self, destination):
        '''\
        Add an entry point

        :param destination: node to route to initially
        :type destination: str
        '''
        self.routes.setdefault('__entry_point', set()).add(destination)
        return self.routes['__entry_point']
\
        Add an entry point

        :param destination: node to route to initially
        :type destination: str