  In this paper we show that the singular locus of a Legendrian foliation as
defined in [Hua13] is a compact submanifold whose connected components are of
codimension at most two. As a consequence, given any closed $(n+1)$-dimensional
coisotropic submanifold $W$ in a contact $(2n+1)$-manifold, the contact
structure in a sufficiently small neighborhood of $W$ is uniquely determined by
the characteristic (Legendrian) foliation.
