diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf5f82e..daade96 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- `document` API for creating Gemini documents
 
 ## [0.3.0] - 2020-11-14
 ### Added