--- a/RELEASE_NOTES	Thu May 28 21:38:49 2009 -0700
+++ b/RELEASE_NOTES	Thu May 28 21:41:45 2009 -0700
@@ -29,7 +29,9 @@
  
 API changes from ns-3.4
 -----------------------
-API changes for this release are documented in the file CHANGES.html
+API changes for this release are documented in the file CHANGES.html.  The
+internal API and composition of the IPv4 stack underwent significant
+refactoring in this release cycle.
 
 Release 3.4
 ===========