Gaia g-band magnitude distribution of AGN candidates in our ZTF selection and in the Gaia-unWISE selection C75. The distribution of sources in both catalogues is plotted in green, of sources in the ZTF catalogue and not in the C75 catalogue in blue, and sources in the C75 catalogue and not in the ZTF catalogue in yellow. The largest source of incompleteness in the ZTF catalogue is its limited depth.