--- a/src/spectrum/model/half-duplex-ideal-phy.h	Wed May 18 20:01:44 2011 -0400
+++ b/src/spectrum/model/half-duplex-ideal-phy.h	Wed May 18 17:24:04 2011 -0700
@@ -40,6 +40,8 @@
 
 
 /**
+ * \ingroup spectrum
+ *
  * This PHY layer implementation realizes an ideal OFDM PHY which
  * transmits half-duplex (i.e., it can either receive or transmit at a
  * given time). The device is ideal in the sense that: