Drechsler, S.-L., Nishimoto, S., Kuzian, R. O., Malek, J., Lorenz, W. E. A., Richter, J., et al. (2011). Comment on “Two-Spinon and Four-Spinon Continuum in a Frustrated Ferromagnetic Spin-1/2 Chain”. Physical Review Letters, 106(21): 219701, pp. 219701-1-219701-1. doi:10.1103/PhysRevLett.106.219701.