--- a/src/spectrum/model/aloha-noack-mac-header.h	Wed May 18 20:01:44 2011 -0400
+++ b/src/spectrum/model/aloha-noack-mac-header.h	Wed May 18 17:24:04 2011 -0700
@@ -28,6 +28,10 @@
 
 namespace ns3 {
 
+/**
+ * \ingroup spectrum
+ *
+ */
 class AlohaNoackMacHeader : public Header
 {
 public: