Weidentified a small error in the code used to perform the calculations of exciton-phonon couplings presented in this work. The corrected code results in small quantitative differences and minor qualitative differences, as reflected in the corrected figures below (Figures 1, 2, 3, 4, and 5). The corrected results show that the reorganization energies of higherfrequency, optical modes scales as λop∝ D-2.5. Simple continuum models predict that the contribution to the reorganization energy from optical modes scales as λop∝ D-1. However, this predicted scaling is based on a long-range, Frohlich coupling mechanism, which is minor in CdSe and CdS systems and is not included in our model. Additionally, in core-shell NCs, phonon modes localized to the core of the NC dominate contributions to the reorganization energy. All equations presented in the original paper are correct. This correction does not influence the discussions or conclusions of the original paper.