Zwave firmware upgrade- what is it supposed to be fixing or adding?

[Slate]

Release 2.4.1 Available

Release 2.4.1.157 Available Changes from 2.4.1.156 Bug Fixes Rule 5.1: Fixed erroneous Event Subscriptions for Triggers that compare a Hub Variable. Affected rules will need an Update or Done.

I believe it might be buried somewhere in there. Not positive.