Unused Local Variable

In RubyMine 6, "Unused Local Variables" are underlined, but there is no explanation as to why unless you run a code inpsector and read the results.  




With other inspections, all you need to do is mouse over the underlined code and an explanation for the inspection will automatically show in the tooltip, but not for Unused Local Variables.  Is there something I need to do to enable this?  If I remember correctly, the inspector tooltip used to show up for this particular item in previous releases.  Is there something I need to do to enable the tooltip for this particular error?

Rubymine 6.0
OSX Mavericks