  We prove the equivalence of EL-shellability and the existence of recursive
atom ordering independent of roots. We show that a comodernistic lattice, as
defined by Schweig and Woodroofe, admits a recursive atom ordering independent
of roots, therefore is EL-shellable. We also present and discuss a simpler
EL-shelling on one of the most important classes of comodernistic lattice, the
order congruence lattices.
