Tau Decays in Pythia 8

As of version 8.150 of Pythia, the isotropic decay model of τ-leptons has been replaced with sophisticated τ-lepton decay machinery. The decays and spin correlations for τ-leptons in Pythia 8 are described, including the spin correlation algorithm, the available τ-lepton production processes, the τ-lepton decay models, the user interface, and the implementation.