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The authors of a recent paper evidently take the view that the whole ofprogress made toward a theoretical understanding of the physics of quantum spinliquids (QSL) is associated with models of the kind proposed and applied intheir present work. As motivation for this work, they observe that in contrastto existing theoretical models of both gapped and gapless spin liquids, whichgive rise to sharp dispersive features in the dynamic structure factor, themeasured dynamic structure factor reveals an excitation continuum that isremarkably flat as a function of frequency. They go on to assert that "so far,the only theoretical model for a spin liquid state on the kagome lattice whichnaturally gives rise to a flat excitation band at low energies consists of the$Z_2$ spin liquids". Here we point out that there already exists a differentand demonstrably successful approach to the QSL problem that does naturallyfeature a flat band.

Comment on "Topological excitations and the dynamic structure factor of  spin liquids on the kagome lattice" (Punk, M., Chowdhury, D. & Sachdev, S.  Nature Physics 10, 289-293 (2014))