Constructor documentation assigned to class or __init__?

[Leif K-Brooks]

Should a class's constructor be documented in the class's docstring or 
__init__'s docstring? For instance:

class Foo(object):
	"""This class represents mating lizards. Constructor requires one 
argument, the lizard this lizard is mating with."""
	def __init__(self, other):
		pass

# or

class Bar(object):
	""This class represents mating lizards."""
	def __init__(self, other):
		"""Initiate the object. Requires one argument, "other", which is the 
lizard this lizard is mating with."""
		pass