--- a/src/spectrum/model/spectrum-type.h	Wed May 18 20:01:44 2011 -0400
+++ b/src/spectrum/model/spectrum-type.h	Wed May 18 17:24:04 2011 -0700
@@ -31,6 +31,8 @@
 
 
 /**
+ * \ingroup spectrum
+ *
  * This class represent a type of signal that can be transmitted by
  * SpectrumPhy instances over a SpectrumChannel. By means of this
  * class a SpectrumPhy is able to recognize which type of signals it
@@ -62,6 +64,10 @@
 
 
 
+/**
+ * \ingroup spectrum
+ *
+ */
 class SpectrumTypeFactory
 {