  In a recent paper Boyanovsky et al (hep-ph/9608205) studied preheating for a
particular theory of the inflaton field. Although they results essentially
confirm those of the original papers on reheating after inflation, they claimed
that most of the earlier works on preheating did not take into account
backreaction of created particles, misused the Mathieu equation, and were
inconclusive about the symmetry restoration after preheating. We explain why we
cannot agree with these statements.
