"Exposing Attributes of C++ Types to QML" example missing signal declaration

In the QtQml documentation, under the "Exposing Attributes of C++ Types to QML" topic, there is a chapter called "Exposing properties", which contains an example (http://qt-project.org/doc/qt-5.0/qtqml/qtqml-cppintegration-exposecppattributes.html#exposing-properties) of a class that is emitting a signal called authorChanged, but the signal declaration is missing.

This is nothing major, but I thought you should know.