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diff --git a/os/hal/dox/serial_usb.dox b/os/hal/dox/serial_usb.dox
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+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
+
+    This file is part of ChibiOS/RT.
+
+    ChibiOS/RT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    ChibiOS/RT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @defgroup SERIAL_USB Serial over USB Driver
+ * @brief Serial over USB Driver.
+ * @details This module implements an USB Communication Device Class
+ *          (CDC) as a normal serial communication port accessible from
+ *          the device application.
+ * @pre     In order to use the USB over Serial driver the
+ *          @p HAL_USE_SERIAL_USB option must be enabled in @p halconf.h.
+ *
+ * @section usb_serial_1 Driver State Machine
+ * The driver implements a state machine internally, not all the driver
+ * functionalities can be used in any moment, any transition not explicitly
+ * shown in the following diagram has to be considered an error and shall
+ * be captured by an assertion (if enabled).
+ * @if LATEX_PDF
+ * @else
+ * @endif
+ *
+ * @ingroup IO
+ */