Index: sources/storage/usbwatcher.h
===================================================================
diff -u -r56d00a82669a7a2c00ab90109a89dbec8db27527 -r415f3e16ff6e572c8ce7e7b3576e82ce8b44c6ce
--- sources/storage/usbwatcher.h	(.../usbwatcher.h)	(revision 56d00a82669a7a2c00ab90109a89dbec8db27527)
+++ sources/storage/usbwatcher.h	(.../usbwatcher.h)	(revision 415f3e16ff6e572c8ce7e7b3576e82ce8b44c6ce)
@@ -25,6 +25,12 @@
 
 namespace Storage {
 
+/*!
+ * \brief   The USBWatcher class
+ * \details This class is to watch the USB device to be mounted if plugged in
+ * or to be unmounted if user through UI requests it.
+ * and will notify UI (user) on mounted and removed(No USB drive exists).
+ */
 class USBWatcher : public QObject
 {
     Q_OBJECT
@@ -60,8 +66,22 @@
     bool usbSeek(QString &vDevice);
 
 signals:
+    /*!
+     * \brief   didUSBDriveMount
+     * \details notifies UI when USB device is available and has been mounted.
+     */
     void didUSBDriveMount ();
+
+    /*!
+     * \brief   didUSBDriveUmount
+     * \details notifies USB watcher on UI(user) request for USB umount.
+     */
     void didUSBDriveUmount();
+
+    /*!
+     * \brief   didUSBDriveRemove
+     * \details notifies UI when USB device has been removed(not exists).
+     */
     void didUSBDriveRemove();
 
 private slots: