  We present measurements from Belle and BABAR of the time-dependent
CP-violation parameters S and C in B->eta'K0 decays. Both experiments observe
mixing-induced CP violation with a significance of more than 5 standard
deviations in this b-> s penguin dominated mode. We also compare with
theoretical expectations and discuss the latest results for SU(3)-related
decays which are useful for obtaining bounds on the expected values of S and C.
