diff --git a/prism/CHANGELOG.txt b/prism/CHANGELOG.txt
index 4e1f43c7..eb1fc943 100644
--- a/prism/CHANGELOG.txt
+++ b/prism/CHANGELOG.txt
@@ -12,6 +12,12 @@ Ongoing changes:
 * New version of explicit engine (including extra methods e.g. for MDPs)
 * Property names allowed, but mostly not used
 
+-----------------------------------------------------------------------------
+Version 4.0.beta2 (released 10/6/2011)
+-----------------------------------------------------------------------------
+
+* Bug fixes: simulator, error messages, typos and examples
+
 -----------------------------------------------------------------------------
 Version 4.0.beta (released 16/12/2010)
 -----------------------------------------------------------------------------