Addendum to: Milne, Values of zeta functions of varieties over finite   fields, Amer. J. Math. 108, (1986), 297-360
  The original article expressed the special values of the zeta function of a variety over a finite field in terms of the $\hat{Z}$-cohomology of the variety. As the article was being completed, Lichtenbaum conjectured the existence of certain motivic cohomology groups. Progress on his conjecture allows one to give a beautiful restatement of the main theorem of the article in terms of $Z$-cohomology groups. 
J. S. Milne
math.AG