How to comment constant values?

[Erwin Mueller]

Hello, I'm new to Python (using it for two months) and I wonder how can I 
comment the const. values with the doc-strings. I.e. if I have code:

>FRACTION_MIN = 1
>FRACTION_MAX = 10
>
>class Fraction(collections.MutableSequence):
>    '''Model a fraction with denominators.
>
>    It contains one ore more denomintors in a list for quick access.
>    The class is thread save, it uses a lock for all operations.
>    '''
>
>    def __init__(self):
>		# ...

The class and the methods can have doc-strings, but what about the const. 
values, FRACTION_MIN and FRACTION_MAX?

Thank you, Erwin.