diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5519feb07..a4c624013 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Rare bug arising from degenerate `SubstanceParameter.comp_df` rows that caused
   wrong number of recommendations being returned
+- State spaces are now stateless, preventing unintended side effects that could lead to
+  incorrect candidate sets when reused in different optimization contexts 
 
 ### Deprecations
 - Passing a dataframe via the `data` argument to `Objective.transform` is no longer