  Previous studies of the kinematic coverage for measuring the photon structure
function F_2^gamma at a future 500 GeV e^+e^- linear collider are updated using
current estimates of luminosities and important detector parameters. The
perturbative expansion for the evolution of F_2^gamma is briefly recalled in
view of a recent claim that all existing next-to-leading order analyses of the
photon structure are incorrect. A simple illustration is given of the different
sensitivities of hadronic and photonic structure functions on the strong
coupling constant alpha_s.
