diff --git a/prism/CHANGELOG.txt b/prism/CHANGELOG.txt
index f8e28ecb..6fd7b1e6 100644
--- a/prism/CHANGELOG.txt
+++ b/prism/CHANGELOG.txt
@@ -8,9 +8,9 @@ Version 4.3 (first released ???)
 
 * New model checking functionality/optimisations
   - lower time-bounds for properties of DTMCs/MDPs (e.g. P=? [ F>=2 "target" ])
-  - arbitrary precision computation via the parametric engine (switch -exact)
   - expected total rewards (R[C]) implemented for DTMCs in symbolic engine
   - backwards reachability algorithm implemented for model checking PTAs
+  - exact (arbitrary precision) model checking via the parametric engine (experimental)
   - various LTL model checking optimisations
   - faster precomputation by pre-computing predecessors