Please help me -- H1B - RFE question - need help

For a H1B extension, there is a list of documents asked for. Amoung that one document i am not able to understand what need to be submitted. (please find it below)

"Copy of work schedules from prior years; "

Can someone please help me by saying what is it ? and what document i need to submit for this . Any immediate help will be really appreciated.