  This document expands upon the relationship between discrete and continuous
entropy given in (Phys. Rev. Lett. 110 130407), \Violating Continuous Variable
Einstein-Podolsky-Rosen Steering with Discrete Measurements". We provide a
detailed derivation for the inequality relating the continuous conditional
entropy to its discrete approximation, and show how this connection works
between discrete and continuous entropic quantities in general. In addition, we
use this connection to show how to derive the continuous variable
Einstein-Podolsky-Rosen steering inequality with discrete measurements as seen
in (Phys. Rev. Lett. 110 130407), and make an additional comment which
strengthens this result.
