Update header in CHANGELOG.md
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39d3d64..fe364eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,7 +12,7 @@
* [GH-45357](https://github.com/apache/arrow/issues/45357) - [C++] Disable failing arrow-flight-test when misusing the library
-## New Features and Improvements
+## Improvements
* [GH-45201](https://github.com/apache/arrow/issues/45201) - [C++][Parquet] Improve performance of writing size statistics
* [GH-45304](https://github.com/apache/arrow/issues/45304) - [C++] Compatibility with newer aws sdk