[Ifeffit] How to make a hole on feff.inp file

Dear members I have been treating with an EXAFS spectra of an oxide crystals. This crystal has some holes (defects) in the system.I have not a good idea in handling of the hole system, I put hydrogen instead of the hole. I think this procedure is not appropriated. Please teach me how to make hole on a feff.inp file. Thank you. Joji Kuniya