How does the hysteresis adjust work on an ADCMP567?

The spec sheet implies that the LEB pin needs to be slightly more positive than the LE pin to increase the hysteresis, but when I set it this way the comparator latches up.  I'm grounding the LE pin and setting the LEB pin to about +15mV.  Should I actually be programming the LEB pin to be negative with respect to the LE pin?