  The BESIII experiment at the Beijing Electron Positron collider, run as a
``hyperon factory'', recently reported the first measurement of the asymmetry
parameter of the $\Lambda\to n\gamma$ decay and updated its branching fraction,
which differs from the PDG average by 5.6 sigma. We highlight the impact of
this new measurement on our understanding of the puzzle of weak radiative
hyperon decays and pinpoint what needs to be done in the future.
