diff --git a/axum/CHANGELOG.md b/axum/CHANGELOG.md
index 110a379e..c5f74759 100644
--- a/axum/CHANGELOG.md
+++ b/axum/CHANGELOG.md
@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 # Unreleased
 
-- None.
+- **added:** Implement `Default` for `Extension` ([#1043])
 
 # 0.5.6 (15. May, 2022)
 
diff --git a/axum/src/extension.rs b/axum/src/extension.rs
index 83ba7111..55efa1b5 100644
--- a/axum/src/extension.rs
+++ b/axum/src/extension.rs
@@ -69,7 +69,7 @@ use tower_service::Service;
 /// #[derive(Clone)]
 /// struct Foo(&'static str);
 /// ```
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Default)]
 pub struct Extension<T>(pub T);
 
 #[async_trait]