  Warm inflation dynamics is fundamentally based on a system-reservoir
configuration in which the dynamics is dictated by a fluctuation-dissipation
relation. Recent work by Cerioni et. al. (arXiv:0804.0163) examined dissipative
dynamics with no associated fluctuation component. Their results, which are
heavily dependent on initial conditions, are at odds with results in the warm
inflation literature, especially the spectral indices. The inconsistency of
their formalism is outlined here and it is shown how this would lead to their
erroneous conclusions. It is then shown how, following the correct dynamical
equations of warm inflation, the results in the literature are correct.
