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A recent article "An X-ray chimney extending hundreds of parsecs above andbelow the Galactic Centre" (2019, Nature, 567, 34) reported the detection ofchimney-like X-ray-emitting features above and below the Galactic Center fromXMM-Newton observations. We note here that these features were already reportedby our Suzaku papers: Nakashima et al. (2013, ApJ, 773, 20, arXiv:1310.4236)for the southern feature and Nakashima et al. (2019, ApJ, in press,arXiv:1903.02571) for the northern feature. In particular, Nakashima et al.(2013) show that the ionization state of the southern feature is not incollisional ionization equilibrium and is most likely in a recombining orover-ionized state, which suggests its origin in the Galactic Center about 0.1Myr ago.

Comment on "An X-ray chimney extending hundreds of parsecs above and below the Galactic Centre" (2019, Nature, 567, 34)