$Q_{\rm cp}$ of electrons from heavy-flavour hadron decays in 0-20\%, 20-40\% and 40-60\% multiplicity classes in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. The vertical error bars and the empty boxes represent the statistical and systematic uncertainties, respectively. The solid boxes at high \pt at $Q_{\rm cp}$ = 1 represent the normalisation uncertainties. The results are compared to ALICE results on charged particles in p--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV  .