--- a/src/energy/model/energy-source.h	Wed May 18 23:38:16 2011 +0200
+++ b/src/energy/model/energy-source.h	Wed May 18 14:56:28 2011 -0700
@@ -30,6 +30,13 @@
 namespace ns3 {
 
 /**
+ * \defgroup energy Energy Models
+ *
+ */
+
+/**
+ * \ingroup energy
+ *
  * \brief Energy source base class.
  *
  * This is the base class for energy sources. Energy sources keep track of