QTimer documentation should mention that negative intervals are not allowed

The following code:

QTimer t;
t.start(-1);

Results in the runtime error:

QObject::startTimer: QTimer cannot have a negative interval

I expected t.start(-1) to behave the same way as t.start(0). The possibility of a runtime error should be documented at http://qt-project.org/doc/qt-5/qtimer.html#interval-prop and http://qt-project.org/doc/qt-5/qobject.html#startTimer