Recognizing Revenue month over mont for a multi month contract

Hello,

I have a question that most of the people in here will think is a breeze. I am trying to track revenue over a multi month contract. For example, If I have a $30,000 contract, the services start on 5/1/13 I recognize 1/6 in May, 1/3 in June, July and 1/6 in August, ending on 8/14/13. I have attached what I have done so far but am getting stuck on how to roll it over month to month. Any help would be greatly appreciated!

Thanks,
Ron