StorageInfo QML Element Documentation missing from Qt SDK & online docs

Qt Mobility System Information API has a QML element matching QSystemStorageInfo. This fact can be seen when checking the code in qt-mobility/plugins/declarative/systeminfo/systeminfo.cpp: qmlRegisterType<QSystemStorageInfo>(uri, 1, 1, "StorageInfo");

Unfortunately that, and blindly trying, is the only way to know that this element exists, since the documentation does not mention it anywhere.