2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35899Several comments are given to previous proofs of the generalised second law of thermodynamics: black hole entropy plus ordinary matter entropy never decreases for a thermally closed system. Arguments in favour of its truism are given in the spirit of conventional thermodynamics.10 pages, LatexGeneral Relativity and Quantum Cosmologytext