Index: generic/src/time/clock.c
===================================================================
--- generic/src/time/clock.c	(revision 280a27e37f59414f14a49f3d48620945ee8580e0)
+++ generic/src/time/clock.c	(revision 9a68b34d997aee7a6bb46e96ef6da51cb260bcaf)
@@ -27,4 +27,13 @@
  */
 
+/**
+ * @file	clock.c
+ * @brief	High-level clock interrupt handler.
+ *
+ * This file contains the clock() function which is the source
+ * of preemption. It is also responsible for executing expired
+ * timeouts.
+ */
+ 
 #include <time/clock.h>
 #include <time/timeout.h>
Index: generic/src/time/delay.c
===================================================================
--- generic/src/time/delay.c	(revision 280a27e37f59414f14a49f3d48620945ee8580e0)
+++ generic/src/time/delay.c	(revision 9a68b34d997aee7a6bb46e96ef6da51cb260bcaf)
@@ -27,4 +27,9 @@
  */
 
+/**
+ * @file	delay.c
+ * @brief	Active delay function.
+ */
+ 
 #include <time/delay.h>
 #include <arch/types.h>
Index: generic/src/time/timeout.c
===================================================================
--- generic/src/time/timeout.c	(revision 280a27e37f59414f14a49f3d48620945ee8580e0)
+++ generic/src/time/timeout.c	(revision 9a68b34d997aee7a6bb46e96ef6da51cb260bcaf)
@@ -25,4 +25,9 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @file	timeout.c
+ * @brief	Timeout management functions.
  */