--- a/src/devices/wifi/propagation-loss-model.h	Wed Oct 17 13:39:05 2007 +0200
+++ b/src/devices/wifi/propagation-loss-model.h	Wed Oct 17 15:50:38 2007 +0200
@@ -11,6 +11,7 @@
 {
 public:
   virtual ~PropagationLossModel ();
+  // returns the rx power in dbms
   virtual double GetRxPower (double txPowerDbm,
 			     double distance) const = 0;