diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f2fde1..d0faedd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,10 +14,12 @@ Procedure when bumping the version number:
 ## Unreleased
 
 ### Changed
-- Error handling of `Action`s is now more complex but more powerful. In
+- **(breaking)**
+  Error handling of `Action`s is now more complex but more powerful. In
   particular, `Action`s can now return almost arbitrary errors without nesting
   `Result`s like before.
-- Renamed `Action::Result` to `Action::Output`
+- **(breaking)**
+  Renamed `Action::Result` to `Action::Output`
 
 ## v0.1.0 - 2023-02-12