Manganese/Bismuth co-doped CsPbCl 3 perovskites (PV) exhibit enhanced photo-luminescence in different regions of the UV-VIS spectrum [1] with interesting optoelectronic properties suitable for new generation LED devices. Bismuth is speculated to place trap states in the PV band gap with subsequent PL emission,[2] while Mn presents the atomic 4 T 1-> 6 A 1 emission.[3] We attempted to model the optical properties of Mn/Bi co-doped perovskites by means of HSE06-SOC periodic DFT calculations, a work recently published on J Phys. Chem. Lett., 2020, 11.14, 5482-5489.[4]