In Figure 2 of the aforementioned paper by Alam, Clelland, and Hrenya, the stresses obtained using molecular-dynamic simulations of binary-sized systems were compared to stresses obtained using the kinetic-theory model for binary mixtures developed by Willits and Arnarson (Phys. Fluids, 11, p. 3116, 1999). An error was found in calculations for the Willits and Arnarson theory. Figure 1 (below) shows the corrected theoretical predictions, along with the original simulation data. These corrections result in an improved match between simulations and theory. In particular, the theoretical predictions compare well with the simulation data across the entire range of diameter ratios investigated.