Repair holiday data after the fact?

["Gary Fritz" <fritz@xxxxxxxx>]

Ooops!  After taking some time off over the long weekend, I just 
realized my holiday list got deleted at some point.  So my system 
didn't know Thursday was supposed to be a holiday.

Does anyone have the description of "how to repair your history 
database if you forget to enter a holiday until after the holiday is 
over" handy?  If so, could you please send me a copy?

Thanks!
Gary