Generally, dispersion corrections do noticeably impact the covalently bonded properties of HCNO but do not provide a consensus as to which direction the shift occurs. Across all bond distances and all functionals, the mean absolute shift (MAS) was only 0.0002 Å with a standard Over the set of all harmonic frequencies and all dispersion corrections to parent DFAs, the MAS and σD are 1.7 and 4.1 cm -1 , respectively. In accord with Badger's Rule, 109 dispersion corrections that give bond distance contractions yield increases in ω1-ω3 values and vice versa.