Ratio of normalized $\psi{\rm (2S)}\mbox{-over-}{\rm J}/\psi$ yield as a function of the normalized charged-particle pseudorapidity density in pp collisions at $\sqrt{s}$ = 13 TeV and p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV. The pp results are normalized to the INEL$>$0 event class, whereas the p-Pb ones refer to the NSD one.