diff --git a/wiki/ReleaseNotes.wiki b/wiki/ReleaseNotes.wiki
index 302ce02e..c7a171ad 100644
--- a/wiki/ReleaseNotes.wiki
+++ b/wiki/ReleaseNotes.wiki
@@ -1,5 +1,27 @@
 #summary Changelog and notes about CORE releases.
 
+= 4.2 =
+CORE 4.2 was released on 8/??/11.
+
+The high-level changes since version 4.1 are:
+ * EMANE 0.7.1 support<br>support for Bypass model, Universal PHY, logging, realtime
+ * configurable MAC addresses
+ * control interfaces (backchannel between node and host)
+ * service customization dialog improved (tabbed)
+ * new testing scripts for MDR and EMANE performance testing
+ * improved upgrading of old imn files
+ * new coresendmsg.py utility (deprecates libcoreapi and coreapisend)
+ * new security services, custom service becomes UserDefined
+ * new services and Python scripting chapters in manual
+ * fixes to distributed emulation, linking tunnels/RJ45s with WLANs/hubs/switches
+ * fixed the following bugs:<br>18, 32, 34, 38, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49,<br>52, 53, 55, 57, 58, 60, 62, 64, 65, 66, 68, 71, 72, 74
+
+Known issues with 4.2:
+ * [http://code.google.com/p/coreemu/issues/detail?id=39 issue 39] OSPF hellos become synchronized after 1 hr of running
+ * [http://code.google.com/p/coreemu/issues/detail?id=56 issue 56] wait for services shutdown
+ * [http://code.google.com/p/coreemu/issues/detail?id=63 issue 63] EMANE events not restricted to localhost lo device
+
+
 = 4.1 =
 CORE 4.1 was released on 1/5/11.