CARMENES. IV: CARMENCITA, the input catalogue archive Caballero, Cortés-Contreras, López-Santiago, Morales, Alonso-Floriano, Dorda, Klutsch, Montes, Mundt, Reiners, Ribas CARMENES, the new near-infrared/optical high-resolution spectrograph for the 3.5m Calar Alto Telescope, is expected to see its first light in early 2014. Before that, we must have chosen carefully the 300 M dwarfs to which CARMENES will look for telluric exoplanets with the radial-velocity method. CARMENCITA, the CARMENES Cool dwarf Information and daTa Archive, will be the most comprehensive database on M dwarfs ever built, with dozens of parameters measured by us or compiled from the literature (from accurate coordinates and proper motions, through spectral types, magnitudes, Halpha and X-rays, to vsini or multiplicity at all separations) for almost 1000 of the brightest, latest M dwarfs in the solar neighbourhood.