--- a/src/core/model/default-simulator-impl.h	Tue Jun 11 16:45:01 2013 -0700
+++ b/src/core/model/default-simulator-impl.h	Tue Jun 11 16:45:49 2013 -0700
@@ -33,6 +33,9 @@
 
 namespace ns3 {
 
+/**
+ * \ingroup simulator
+ */
 class DefaultSimulatorImpl : public SimulatorImpl
 {
 public:

--- a/src/core/model/realtime-simulator-impl.h	Tue Jun 11 16:45:01 2013 -0700
+++ b/src/core/model/realtime-simulator-impl.h	Tue Jun 11 16:45:49 2013 -0700
@@ -35,6 +35,9 @@
 
 namespace ns3 {
 
+/**
+ * \ingroup simulator
+ */
 class RealtimeSimulatorImpl : public SimulatorImpl
 {
 public:

--- a/src/core/model/simulator.h	Tue Jun 11 16:45:01 2013 -0700
+++ b/src/core/model/simulator.h	Tue Jun 11 16:45:49 2013 -0700
@@ -39,6 +39,10 @@
 
 /**
  * \ingroup core
+ * \defgroup simulator Simulator
+ */
+/**
+ * \ingroup simulator
  *
  * \brief Control the scheduling of simulation events. 
  *

--- a/src/mpi/model/distributed-simulator-impl.h	Tue Jun 11 16:45:01 2013 -0700
+++ b/src/mpi/model/distributed-simulator-impl.h	Tue Jun 11 16:45:49 2013 -0700
@@ -84,6 +84,7 @@
 };
 
 /**
+ * \ingroup simulator
  * \ingroup mpi
  *
  * \brief distributed simulator implementation using lookahead

--- a/src/visualizer/model/visual-simulator-impl.h	Tue Jun 11 16:45:01 2013 -0700
+++ b/src/visualizer/model/visual-simulator-impl.h	Tue Jun 11 16:45:49 2013 -0700
@@ -33,6 +33,7 @@
 
 /**
  * \ingroup visualizer
+ * \ingroup simulator
  *
  * \brief A replacement simulator that starts the visualizer
  * \internal