title: Comment on "Ferroelectric order of parallel bistable hydrogen bonds".
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, 211189, People's Republic of China.
authors.forename: Hong-Ling
authors.initials: HL
authors.lastname: Cai
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Fu
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Wen
authors.initials: W
authors.lastname: Zhang
authors.forename: Ren-Gen
authors.initials: RG
authors.lastname: Xiong