Updated Compile in Windows (markdown)

Compile-in-Windows.md

@@ -31,6 +31,8 @@ After an initial build of 'ninja package', rather than repeatedly building the i
 
 Passing  `-DCMAKE_BUILD_TYPE=Debug` or `-DCMAKE_BUILD_TYPE=RelWithDebInfo` (lighter but may be less precise) to the cmake command will create a version that is easier to debug for yourself or the maintainers.
 
+Passing -DDEBUG_OUTPUT=ON will enable debug output (qDebug()) to the console.
+
 ## Debugging
 
 To debug using Visual Studio, run: