Error with Passing a class name as a parameter in a ManyToManyField

This is my first time using the Django Web Framework and I'm new to the python language, so please bear with me.

I've created a model (i.e. a class) called Course which defines several variables:

class Course(models.Model):

        name = models.CharField(max_length=32)

                                   .

                                   .  

                                   .

                                   .

        prereq = models.ManyToManyField(Course, blank=True, null=True, through='PreReqToCourse')

When I try to serve the files from the local server with, python manage.py runserver, I get the following error:

...

...

prereq = models.ManyToManyField(Course, blank=True, null=True, through='PreReqToCourse')

NameError: name 'Course' is not defined

Any ideas? 

Thanks in advance! 

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