--- a/src/core/model/timer-impl.h	Wed Dec 17 12:17:11 2014 -0800
+++ b/src/core/model/timer-impl.h	Thu Dec 18 15:12:35 2014 -0800
@@ -137,14 +137,14 @@
 
 
 /********************************************************************
-   Implementation of TimerImpl implementation functions.
+ *  Implementation of TimerImpl implementation functions.
  ********************************************************************/
 
 namespace ns3 {
 
 /**
  * \ingroup timer
- * \defgroup timerimpl TimerImpl implementation details.
+ * \defgroup timerimpl TimerImpl Implementation
  * @{
  */
   
@@ -966,7 +966,7 @@
 
   
 /********************************************************************
-   Implementation of TimerImpl itself.
+ *  Implementation of TimerImpl itself.
  ********************************************************************/
   
 template <typename T1>