diff --git a/CHANGELOG.md b/CHANGELOG.md
index 97809b4..3931338 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Allow relationship links to be delcared as a method ([#2](https://github.com/fast-jsonapi/fast_jsonapi/pull/2))
 - Test against Ruby 2.6 ([#1](https://github.com/fast-jsonapi/fast_jsonapi/pull/1))
+- Include `data` key when lazy-loaded relationships are included  ([#10](https://github.com/fast-jsonapi/fast_jsonapi/pull/10))
 ### Changed
 - Optimize SerializationCore.get_included_records calculates remaining_items only once ([#4](https://github.com/fast-jsonapi/fast_jsonapi/pull/4))
 - Optimize SerializtionCore.parse_include_item by mapping in place ([#5](https://github.com/fast-jsonapi/fast_jsonapi/pull/5))