2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148778We give a new proof of a theorem by M.P. do Carmo and M. Dajczer on helicoidal surfaces of constant mean curvature.3 pages, LaTeX, no figures. This replacement fixes a LaTeX typo, the two theorems in the paper were referenced by the same numberDifferential Geometry53A10 (Primary) 53C42, 58D19 (Secondary)text