--- a/src/simulator/nstime.h	Thu May 29 19:09:56 2008 -0700
+++ b/src/simulator/nstime.h	Thu May 29 23:24:10 2008 -0700
@@ -60,6 +60,9 @@
 
 
 /**
+ * \ingroup simulator
+ * \defgroup time Time
+ *
  * \brief keep track of time unit.
  *
  * This template class is used to keep track of the value