--- a/src/mpi/model/distributed-simulator-impl.h	Wed May 18 20:01:44 2011 -0400
+++ b/src/mpi/model/distributed-simulator-impl.h	Wed May 18 17:24:04 2011 -0700
@@ -29,6 +29,8 @@
 namespace ns3 {
 
 /**
+ * \ingroup mpi
+ *
  * \brief Structure used for all-reduce LBTS computation
  */
 class LbtsMessage
@@ -82,6 +84,8 @@
 };
 
 /**
+ * \ingroup mpi
+ *
  * \brief distributed simulator implementation using lookahead
  */
 class DistributedSimulatorImpl : public SimulatorImpl