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It is pointed out that the exact renormalization group approach tocosmological perturbation theory, proposed in Matarrese and Pietroni, JCAP 0706(2007) 026, arXiv:astro-ph/0703563 and arXiv:astro-ph/0702653, constitutes amisnomer. Rather, having instructively cast this classical problem into pathintegral form, the evolution equation then derived comes about as a specialcase of considering how the generating functional responds to variations of theprimordial power spectrum.

A Comment on the Path Integral Approach to Cosmological Perturbation Theory