--- a/ui/downloader.h	Thu Sep 25 17:37:03 2014 +0200
+++ b/ui/downloader.h	Thu Sep 25 17:58:12 2014 +0200
@@ -20,6 +20,14 @@
 
 #include "sslconnection.h"
 
+/** @brief High level API to download necessary data.
+ *
+ * The downloader class is the UI interface to the Update server.
+ * It controls the SSL Connection and checks if updates are available
+ * and downloads them on demand. Each Downloader object is intended
+ * to be run only once and controlled mainly by the constructor of
+ * the object.
+ */
 class Downloader: public QThread
 {
     Q_OBJECT