diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c4ad16..69a056a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [unreleased]
+
+### Changed
+- Added CI on GitHub Actions (#10).
+- Replaced `HashMap` with `BTreeMap` to produce cleaner diff (#11).
+
 ## [0.1.0] - 2024-03-18
 
 ### Added
@@ -15,4 +21,5 @@
 - `backup done` subcommand
 - `completion` subcommand
 
+[unreleased]: https://github.com/qwjyh/xdbm/compare/v0.1.0...HEAD
 [0.1.0]: https://github.com/qwjyh/xdbm/releases/tag/v0.1.0