-Sets the position of the gauge.
-This function makes the gauge switch to determinate mode, if it's not already.
+Sets the position of the gauge. The \arg{pos} must be between $0$ and the gauge
+range as returned by \helpref{GetRange}{wxgaugegetrange}, inclusive.
+
+This function makes the gauge switch to determinate mode, if it was in
+indeterminate mode before.