In a recent publication, Mittal et al. tried to assess the stabilities of the chromium oxides at high temperature in order to understand the Cr hexavalent gas emission. For that, they compared the thermodynamic data of chromium oxides from two commercial databases, FactSage and Thermo-Calc, and NIST-JANAF Thermochemical Tables and found significant discrepancies between them. Apparently, some mistakes were being made in their study which led the present authors to re-evaluate their work and correct their analysis.