2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/181217We consider the corrugation instability of the self-similar flow with an accelerating shock in the highly relativistic regime. We derive the correct dispersion relation for the proper modes in the self-similar regime, and conclude that this solution is unstable.25 pages, 10 figures. Accepted for publication in the Astrophysical JournalAstrophysicstext