  MadDM is an automated numerical tool for the computation of dark-matter
observables for generic new physics models. We announce version 3.1 and
summarize its features. Notably, the code goes beyond the mere cross-section
computation for direct and indirect detection. For instance, it allows the user
to compute the fully differential nuclear recoil rates as well as the energy
spectra of photons, neutrinos and charged cosmic rays for arbitrary $2\to n$
annihilation processes. This short user guide equips researchers with all the
relevant information required to readily perform comprehensive phenomenological
studies of particle dark-matter models.
