Amrute et al. (Reports, 25 October 2019, p. 485) claimed that no methods were able to produce high-purity alpha-Al2O3 with surface areas greater than 100 m(2) g(-1), even though much higher surface areas up to 253 m(2) g(-1) have been reported. Moreover, the materials they obtained could be porous aggregates and may not be 13-nm nanoparticles, as claimed.