  This errata fixes a mistake in the part of Giulietti, P.; Liverani, C.;
Pollicott, M. Anosov flows and dynamical zeta functions. Ann. of Math. (2) {\bf
178} (2013), no. 2, 687--773, which proves a spectral gap for contact Anosov
flows with respect to the measure of maximal entropy (Section 7). However, the
first part of the paper, in which it is proved that the Ruelle zeta function is
meromorphic, is unaffected.
