  The interpretation of the origin of the light scattering anomalies near the
transition from incommensurate (IC) to the alpha-phase of quartz by Dolino et
al. (Phys. Rev. Lett. 94, 155701 (2005)) is commented. It is shown that the
observed IC structure is a pure transverse acoustic (TA) modulation without any
soft optic mode component. Such a modulation cannot be responsible for the
observed light scattering contrary to the interpretation by Dolino et al.
