  The observation by the CLEO Collaboration of the decays $B^{(+,0)} \to
K^{(+,0)} \eta'$ is shown to imply a significant but still uncertain
contribution from the flavor-SU(3)-singlet component of the $\eta'$. By
comparing the rate for these decays with others for decays of B mesons to two
pseudoscalar mesons, it is shown that the prospects for observing CP-violating
asymmetries in certain modes such as $B^+ \to \pi^+ \eta$ and $B^+ \to \pi^+
\eta'$ are quite bright.
