diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92c70bc..d3d00a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 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
+
+### Removed
+
+- Backward compatibility with `v0.2.x` databases.
+
 ## [0.4.0] - 2020-05-03
 
 ### Added