add a secretballot middleware to MIDDLEWARE_CLASSES

hello
i have a simple question
please help me if you can


i want to install this package on my project:

https://pypi.python.org/pypi/django-secretballot/

I am doing the installation step by step but after adding 'secretballot', to my installed_apps It says:

* add a secretballot middleware to MIDDLEWARE_CLASSES (see middleware section for details)


I now where MIDDLEWARE_CLASSES is. it's in setteings.py right after installed_apps but i don't
what I have to add to it.
can you tell me what's the point when it says "add a secretballot middleware" ?
i mean how many secretballot middleware we have that i have to add one of them to my installed_apps?

thank you again

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