  In this note, I find a new property of the congruence lattice, Con$L$, of an
SPS lattice $L$ (slim, planar, semimodular, where "slim" is the absence
of~$\mathsf M_3$ sublattices) with more than $2$ elements: \emph{there are at
least two dual atoms in Con$L$}. So the three-element chain cannot be
represented as the congruence lattice of an SPS lattice, supplementing a~result
of G. Cz\'edli.
