--- a/src/wifi/model/ap-wifi-mac.cc	Fri Mar 27 10:03:43 2015 -0700
+++ b/src/wifi/model/ap-wifi-mac.cc	Fri Mar 27 11:28:59 2015 -0700
@@ -49,6 +49,7 @@
 {
   static TypeId tid = TypeId ("ns3::ApWifiMac")
     .SetParent<RegularWifiMac> ()
+    .SetGroupName ("Wifi")
     .AddConstructor<ApWifiMac> ()
     .AddAttribute ("BeaconInterval", "Delay between two beacons",
                    TimeValue (MicroSeconds (102400)),