The generalized EFP dispersion damping expression [Eq. ( )], introduced to accommodate C 7 dispersion, does not prevent a singularity as R → 0 and the revision introduced in Eq. ( ) does not rescue it from this fate. In order to turn the generalized expression into a formally valid damping function, we abandon the concept of Gaussian damping altogether and return to the exponential Tang-Toennies expression in Eq. ( ), as it restores the proper R → 0 limit. Finally, the parameter-free BJ damping function in Eq. ( ) exhibits a small but finite limit as R → 0.