def __init__(self, speed):
    """
      :param speed: Velocity in MPH of the smoke monster
      :type  speed: int
      .. document private functions
      .. automethod:: _evaporate
      """
self.speed = speed

def _evaporate(self):
    """
      Removes the smoke monster from reality. Not to be called by client.
      """
pass
How can I use Sphinx' Autodoc-extension for private methods?