  In a recent paper [Chaos 30, 073139 (2020)] we analyzed an extension of the
Winfree model with nonlinear interactions. The nonlinear coupling function Q
was mistakenly identified with the non-infinitesimal phase-response curve
(PRC). Here, we asses to what extent Q and the actual PRC differ in practice.
By means of numerical simulations, we compute the PRCs corresponding to the Q
functions previously considered. The results confirm a qualitative similarity
between the PRC and the coupling function Q in all cases.
