Cateye Velo comp, changed batt and lost all my mileage!!

Rigga

As above ive changed the battery in my computer and now the main odometer has reset to zero. Does anyone know if its possible to enter your mileage back into it? Can't see anything in the instructions?

This is the one i have....

http://www.evanscycles.com/products/cat ... 5#features

Thanks in advance.