Bartkiewicz et al. [2aaPhys. Rev. A 91, 012103 (2015)PLRAAN1050-294710.1103/PhysRevA.91.012103] provided an alternative analysis of an experiment performed by Danan et al. [1abPhys. Rev. Lett. 111, 240402 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.240402] which presented surprising evidence regarding the past of photons passing through an interferometer. They argued that the quantity used by Danan et al. is not a suitable which-path witness, and proposed an alternative. The weaknesses of the analysis are discussed, and it is argued that the alternative, analyzed properly, provides no new predictions.