diff --git a/Changelog.md b/Changelog.md
index e561fce0e..a313b510d 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,7 @@
 # Unreleased
 
 - **Breaking:** Also return flags for `MapperAllSizes::translate()` ([#207](https://github.com/rust-osdev/x86_64/pull/207))
+- **Breaking:** Use custom error types instead of `()` ([#199](https://github.com/rust-osdev/x86_64/pull/199))
 
 # 0.12.3 – 2020-10-31