Fair point, Qt doesn't use the "do" prefix.  However they do name the slots by what they do, and signals by what they represent.

e.g. http://qt-project.org/doc/qt-5.0/qtcore/qitemselectionmodel.html

here that slot actually setsDirty so for consistency with the variable name it should be named something to reflect that.  Updated is a reflection of the signals that we connect from (e.g. calibration updated leads to setting dirty).