healing chi

Anybody have any idea of the chi cost for the chi power "Healing Chi"? The book only says that the chi cost is "special" and thats all I can find that it says on the matter, it never seems to explain what that means. This must be so obvious I just can't see it and its driving me crazy. Any help would really be appreciated!

I've seen some groups handle it as having a Chi of 0, but most seem to give it a Chi of X with X equal to the amount Wound Points healed if succesfull or the amount incuured if failing.

I did some checking and coukdn't find any thing official and the question was aske on the old Feng Shui mailing list before.

Yes, I checked the errata and searched this site as well but couldn't come up with anything either. Strange that this issue was never attended to officially.