2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135123We prove some results on formality for families of DG algebras; in particular, we prove that formality is stable under specialization. The results are more-or-less known, but it seems that there are no published proofs.13 pages, LaTeX2e. Minor change: added a lemma on algebraizationAlgebraic Geometrytext