  Before decoupling in the early universe, the tightly coupled photon/electron
gas underwent acoustic oscillations. These oscillations should be visible today
in the spectrum of anisotropies. Recently Fang, Huang, and Wu (1996) claimed
that when random processes are accounted for, the phases of these oscillations
are no longer coherent. In fact, they claim that the well-defined peaks will be
completely smoothed out. We show here that their claim is incorrect. The
standard Boltzmann treatment determining the anisotropies is sufficient; random
processes do not change the standard result.
