It has been extensively shown that the mass of black-holes located at the center of galaxies scales with several galaxy properties, most notably the stellar velocity dispersion of the stellar bulge, which is an indicator of stellar mass. The origin of this relation remains controversial, and a leading candidate is AGN feedback. However, new studies (e.g., Woo et al. 2019; https://arxiv.org/pdf/1905.00145.pdf) show that the relation still exists on low-masses ranges (dwarf galaxies) where we do not expect AGN-feedback to be much significant. Therefore the question still remains: how such a correlation can exist? How the central BH 'knows' about galaxy mass (or viceversa)?