In a recent paper, Wang and Pilon [Electrochim. Acta 63 (2012) 55] claimed that electrochemical impedance spectroscopy (EIS) has intrinsic limitations in determining electric double layer capacitances at electrode/electrolyte interfaces. They used classical and modified Poisson-Nernst-Planck (PNP) models for numerically simulating EIS spectra of double layer formation in aqueous electrolyte solutions near planar electrodes. Apparent discrepancies were found between the EIS-derived double layer capacitances and analytical capacitance expressions from Poisson-Boltzmann-type (PB-type) models. In this commentary, we show these apparent discrepancies are trivially caused by the fact that Wang and Pilon compare differential capacitances from EIS spectra with integral capacitances predicted by PB-type models. In fact, we find that the EIS-derived capacitances are in perfect agreement to the PB-type model predictions for the differential capacitance. (C) 2012 Elsevier Ltd. All rights reserved.