Nadine Häring and Hans-Walter Rix re-examine the relationship between the mass of central black holes (M_bh) and the mass of the surrounding bulge (M_bulge) in 30 nearby galaxies. They use improved black hole mass estimates and more accurate bulge mass determinations from Jeans equation modeling. The results show a tight relationship between M_bh and M_bulge, with M_bh ~ M_bulge^1.12 ± 0.06 and a scatter of ~0.30 dex. This scatter is comparable to that in the M_bh - σ and M_bh - concentration relations. The median black hole mass at M_bulge ~ 5 × 10^10 M_sun is 0.14% ± 0.04% of the bulge mass. The study confirms and refines previous findings, showing that the black hole mass fraction is lower than previously estimated. The results indicate that the M_bh - M_bulge relation is as tight as the M_bh - σ relation, with the scatter primarily due to measurement errors. The study also highlights that the scatter in the original Magorrian relation was largely due to overestimated black hole masses. The findings support the idea that black holes play a key role in galaxy evolution, with the M_bh - M_bulge relation being a fundamental property of galaxies. The study provides a more accurate and reliable relationship between black hole mass and bulge mass, with implications for understanding galaxy formation and evolution.Nadine Häring and Hans-Walter Rix re-examine the relationship between the mass of central black holes (M_bh) and the mass of the surrounding bulge (M_bulge) in 30 nearby galaxies. They use improved black hole mass estimates and more accurate bulge mass determinations from Jeans equation modeling. The results show a tight relationship between M_bh and M_bulge, with M_bh ~ M_bulge^1.12 ± 0.06 and a scatter of ~0.30 dex. This scatter is comparable to that in the M_bh - σ and M_bh - concentration relations. The median black hole mass at M_bulge ~ 5 × 10^10 M_sun is 0.14% ± 0.04% of the bulge mass. The study confirms and refines previous findings, showing that the black hole mass fraction is lower than previously estimated. The results indicate that the M_bh - M_bulge relation is as tight as the M_bh - σ relation, with the scatter primarily due to measurement errors. The study also highlights that the scatter in the original Magorrian relation was largely due to overestimated black hole masses. The findings support the idea that black holes play a key role in galaxy evolution, with the M_bh - M_bulge relation being a fundamental property of galaxies. The study provides a more accurate and reliable relationship between black hole mass and bulge mass, with implications for understanding galaxy formation and evolution.