--- a/ui/CMakeLists.txt	Wed Mar 26 12:38:10 2014 +0100
+++ b/ui/CMakeLists.txt	Wed Mar 26 13:30:33 2014 +0100
@@ -17,6 +17,7 @@
     ${CMAKE_CURRENT_SOURCE_DIR}/main.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/listupdatedialog.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/helpdialog.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/aboutdialog.cpp
     ${CERTIFICATELIST_SOURCES}
     ${DOWNLOADER_SOURCES}
 )

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/aboutdialog.cpp	Wed Mar 26 13:30:33 2014 +0100
@@ -0,0 +1,28 @@
+#include "aboutdialog.h"
+#include <QDebug>
+#include <QVBoxLayout>
+#include <QTextEdit>
+#include <QPushButton>
+
+AboutDialog::AboutDialog(QMainWindow *parent) :
+    QDialog(parent)
+{
+    setupGUI();
+}
+
+void AboutDialog::setupGUI()
+{
+    QVBoxLayout *mainLayout = new QVBoxLayout(this);
+    QTextEdit *helpText = new QTextEdit;
+    helpText->setReadOnly(true);
+    helpText->setPlainText(tr("This dialog contains some text about the application"));
+
+    QHBoxLayout *buttonLayout = new QHBoxLayout;
+    QPushButton *closeButton = new QPushButton(tr("Close"));
+    connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));
+    buttonLayout->insertStretch(0, 10);
+    buttonLayout->addWidget(closeButton);
+
+    mainLayout->addWidget(helpText);
+    mainLayout->addLayout(buttonLayout);
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ui/aboutdialog.h	Wed Mar 26 13:30:33 2014 +0100
@@ -0,0 +1,21 @@
+#ifndef ABOUTDIALOG_H
+#define ABOUTDIALOG_H
+
+#include <QDialog>
+#include <QMainWindow>
+/**
+ * @file aboutdialog.h
+ * @brief The dialog for information about the application.
+ */
+
+class AboutDialog : public QDialog
+{
+public:
+    /** @brief Create a help dialog */
+    AboutDialog(QMainWindow *parent);
+
+private:
+    void setupGUI();
+
+};
+#endif // ABOUTDIALOG_H

--- a/ui/mainwindow.cpp	Wed Mar 26 12:38:10 2014 +0100
+++ b/ui/mainwindow.cpp	Wed Mar 26 13:30:33 2014 +0100
@@ -27,6 +27,7 @@
 #include "downloader.h"
 #include "listupdatedialog.h"
 #include "helpdialog.h"
+#include "aboutdialog.h"
 
 MainWindow::MainWindow() {
     createActions();
@@ -298,6 +299,8 @@
 void MainWindow::showAbout()
 {
     qDebug() << "show aboutdialog";
+    AboutDialog *about = new AboutDialog(this);
+    about->show();
 }
 
 void MainWindow::showDetails(QListWidgetItem *item)