Document limitation of FileSystemWatcher on Mac OS X

#include <QApplication>
#include <QPlainTextEdit>
#include <QFileSystemWatcher>
#include <QVBoxLayout>
#include <QFile>
#include <QDir>
#include <QTextStream>

class MyWidget : public QWidget
{
    Q_OBJECT
public:
    MyWidget(QWidget *parent = 0) : QWidget(parent)
    {
    int N = 300;
    QDir d(".");
    d.mkdir("files");
    for (int i = 0; i < N; i++) {
        QFile file(QString("files/file%1.txt").arg(i));
        file.open(QIODevice::WriteOnly | QIODevice::Text);
        QTextStream out(&file);
        out << "File contents " << i;
    }
    QLayout *l = new QVBoxLayout(this);
    pte = new QPlainTextEdit(this);
    l->addWidget(pte);
    QFileSystemWatcher *fsw = new QFileSystemWatcher(this);
    connect(fsw, SIGNAL(fileChanged(const QString &)),
            this, SLOT(fileChanged(const QString &)));
    for (int i = 0; i < N; i++) {
        fsw->addPath(QString("files/file%1.txt").arg(i));
    }
    }

public slots:
    void fileChanged(const QString &path)
    {
    pte->appendPlainText(path);
    }

private:
    QPlainTextEdit *pte;
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    MyWidget w;
    w.show();

    return app.exec();
}

#include "main.moc"