Comment on 'Nucleon spin-averaged forward virtual Compton tensor at large Q2'

In recent work, Hill and Paz apply the operator product expansion to forward doubly virtual Compton scattering. The resulting large-Q2 form of the amplitude W1(0,Q2) is compatible with the one we obtain by extrapolation of low-Q2 results from a chiral effective field theory, providing support for our approach. That paper also presents a result for the two-photon contribution to the Lamb shift in muonic hydrogen that has a much larger uncertainty than in previous work. We show that this is an overestimate arising from the inclusion of the proton pole term in the subtracted dispersion relation for W1.