The optical conductivity shows a very narrow Drude peak, which is at least an order of magnitude narrower than one-particle theory predicts, taking the orientational disorder into account. Although the electron-phonon interaction leads to a narrowing of the Drude peak, as expected, we find that the narrowing by a factor of (1+lambda) is by far insufficient to explain the width ( Phys. Rev. B 57, 2163 (1998)).