Real photon structure at an e+e- linear collider

Previous studies of the kinematic coverage for measuring the photon structure function Fγ2 at a future 500 GeV e+e- linear collider [1,2] are updated using current estimates of luminosities and important detector parameters. The perturbative expansion for the evolution of Fγ2 is briefly recalled in view of a recent claim [3] 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 αs