  In a recent Letter, Bares and Mobilia proposed the method to find solutions
of the stochastic evolution operator $H=H_0 + {\gamma\over L} H_1$ with a
non-trivial quartic term $H_1$. They claim, ``Because of the conservation of
probability, an analog of the Wick theorem applies and all multipoint
correlation functions can be computed.'' Using the Wick theorem, they expressed
the density correlation functions as solutions of a closed set of
integro-differential equations.
  In this Comment, however, we show that applicability of Wick theorem is
restricted to the case $\gamma = 0$ only.
