  This is an addendum to the paper ``Deformation of $L_\infty$-Algebras'' of
the same author. We explain in which way the deformation theory of
$L_\infty$-algebras extends the deformation theory of singularities. We show
that the construction of semi-universal deformations of $L_\infty$-algebras
gives explicit formal semi-universal deformations of isolated singularities.
