diff --git a/prism/CHANGELOG.txt b/prism/CHANGELOG.txt
index 60111107..2cf329c4 100644
--- a/prism/CHANGELOG.txt
+++ b/prism/CHANGELOG.txt
@@ -32,7 +32,7 @@ Version 4.0.3 (released 30/1/2012)
   - export in matrix form, e.g. for surface plots
   - export in CSV (rather than tab-separated) form
   - expanded switch: -exportresults file[,opt1,opt2,...] with options: matrix,csv
-* Automatically engine switching if numerical computation not supported
+* Automatic engine switching if numerical computation not supported
 * Optimised Rabin automata for a few common LTL formulae
 * Added -pf as a command-line switch alias for -pctl/-csl
 * Add .props as a properties file extension (in GUI)