2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/72130The definition of the weighted version of difficulty in "Termination of 4-fold canonical flips" contains some errors. In this paper, we describe these errors and how to correct them. Anyway, any sequence of 4-fold canonical flips terminates.7 pagesAlgebraic Geometry14E05; 14J35text