diff --git a/CHANGELOG.md b/CHANGELOG.md
index a40c0e2f..8e93654b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Changed
 
-- Nothing
+- Memory and speed improvements, particularly for the Cell Collection, and the Xlsx and Xls Writers.
 
 ### Deprecated