diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 354540c..3d74d55 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,11 @@ Changelog
 
 * Changed the index columns order in ``MetaLearnerGridSearch.results_``.
 
+* Raise a custom error if only one class is present in the outcome so the reason is more understandable.
+
+* Raise a custom error if the outcome classes present in all the treatment variants are
+  not the same so the reason is more understandable.
+
 0.6.0 (2024-07-08)
 ------------------