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In their publication [Phys. Rev B, 84, 245125 (2011)], Ishioka et al. discussthe recently discovered chiral charge density wave state in 1T-TiSe2 in termsof a parameter H_CDW, whose sign is suggested to correspond to the handednessof the chiral order. Here we point out that H_CDW, as defined by Ishioka etal., cannot be used to characterize chirality in that way. An alternativemeasure of chirality for the specific case of 1T-TiSe2 is suggested.

Comment on "Charge-parity symmetry observed through Friedel oscillations in chiral charge-density waves" by J. Ishioka et al