diff --git a/os/hal/dox/tm.dox b/os/hal/dox/tm.dox
new file mode 100644
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--- /dev/null
+++ b/os/hal/dox/tm.dox
@@ -0,0 +1,31 @@
+/*
+    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
+                 2011 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 TM Time Measurement Driver.
+ *
+ * @brief   Time Measurement unit.
+ * @details This module implements a time measurement mechanism able to
+ *          monitor a portion of code and store the best/worst/last
+ *          measurement. The measurement is performed using the realtime
+ *          counter mechanism abstracted in the HAL driver.
+ *
+ * @ingroup IO
+ */