--- a/src/devices/wifi/yans-wifi-channel.h	Tue Sep 15 13:14:37 2009 +0200
+++ b/src/devices/wifi/yans-wifi-channel.h	Tue Sep 15 14:33:04 2009 +0200
@@ -76,7 +76,9 @@
    * \param preamble the preamble associated to the packet
    *
    * This method should not be invoked by normal users. It is 
-   * currently invoked only from WifiPhy::Send.
+   * currently invoked only from WifiPhy::Send. YansWifiChannel 
+   * delivers packets only between PHYs with the same m_channelNumber,
+   * e.g. PHYs that are operating on the same channel.
    */
   void Send (Ptr<YansWifiPhy> sender, Ptr<const Packet> packet, double txPowerDbm,
              WifiMode wifiMode, WifiPreamble preamble) const;