2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/199611It is pointed out that the exact renormalization group approach to cosmological perturbation theory, proposed in Matarrese and Pietroni, JCAP 0706 (2007) 026, arXiv:astro-ph/0703563 and arXiv:astro-ph/0702653, constitutes a misnomer. Rather, having instructively cast this classical problem into path integral form, the evolution equation then derived comes about as a special case of considering how the generating functional responds to variations of the primordial power spectrum.2 pages, v2: refs added, published in JCAPAstrophysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext