  We discuss the generalization of the leading-twist light-cone distribution
amplitude for light mesons including QED effects. This generalization was
introduced to describe virtual collinear photon exchanges above the
strong-interaction scale $\Lambda_{\rm QCD}$ in the factorization of QED
effects in non-leptonic $B$-meson decays. In this paper we study the
renormalization group evolution of this non-perturbative function. For charged
mesons, in particular, this exhibits qualitative differences with respect to
the well-known scale evolution in QCD only, especially regarding the
endpoint-behaviour. We analytically solve the evolution equation to first order
in the electromagnetic coupling $\alpha_{\rm em}$, which resums large
logarithms in QCD on top of a fixed-order expansion in $\alpha_{\rm em}$. We
further provide numerical estimates for QED corrections to Gegenbauer
coefficients as well as inverse moments relevant to (QED-generalized)
factorization theorems for hard exclusive processes.
