Updating Payroll calendar 2011

Hi Gurus,

I need to update the payroll calendar for 2011. I had defined the dates in the Period modifier and Date modifiers and pay dates for the 2011 as per the dates provided by the business, now what are next steps I need to perform. Please suggest me. Do I need to Generate the payroll period also for 2011 or not required? Please suggest me how to go forward.