--- a/src/devices/wifi/dca-txop.cc	Wed Jun 04 14:02:06 2008 +0100
+++ b/src/devices/wifi/dca-txop.cc	Wed Jun 04 09:18:44 2008 -0700
@@ -99,17 +99,17 @@
   static TypeId tid = TypeId ("DcaTxop")
     .SetParent<Object> ()
     .AddConstructor<DcaTxop> ()
-    .AddAttribute ("MinCw", "XXX",
+    .AddAttribute ("MinCw", "The minimum value of the contention window.",
                    UintegerValue (15),
                    MakeUintegerAccessor (&DcaTxop::SetMinCw,
                                          &DcaTxop::GetMinCw),
                    MakeUintegerChecker<uint32_t> ())
-    .AddAttribute ("MaxCw", "XXX",
+    .AddAttribute ("MaxCw", "The maximum value of the contention window.",
                    UintegerValue (1023),
                    MakeUintegerAccessor (&DcaTxop::SetMaxCw,
                                          &DcaTxop::GetMaxCw),
                    MakeUintegerChecker<uint32_t> ())
-    .AddAttribute ("Aifsn", "XXX",
+    .AddAttribute ("Aifsn", "The AIFSN: the default value conforms to simple DCA.",
                    UintegerValue (2),
                    MakeUintegerAccessor (&DcaTxop::SetAifsn,
                                          &DcaTxop::GetAifsn),