  The recent claim by Kirkpatrick and Belitz (cond-mat/0111398) that Ward
identities could be used to prove the absence of electron dephasing at T=0
contains serious flaws. These authors try to draw conclusions about dephasing
from an analysis of the diffuson, which is not sensitive to this process. The
Cooperon, which does contain this information, is analyzed only in time
reversal symmetric situations, which by assumption excludes any relaxation and
dephasing. Hence, their analysis remains inconclusive for the problem in
question.
