diff --git a/CHANGELOG.md b/CHANGELOG.md
index 175a7fca..b22218a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
+### Added
+- Add madvice operations specific to Darwin. [@turbocool3r](https://github.com/turbocool3r)
+- Implement common traits for the `Advice` enum. [@nyurik](https://github.com/nyurik)
+
+### Changed
+- Make stub implementation Infallible. [@coolreader18](https://github.com/coolreader18)
+- Use `tempfile` crate instead of `tempdir` in tests.
+  [@alexanderkjall](https://github.com/alexanderkjall)
 
 ## [0.5.3] - 2022-02-10
 ### Added
diff --git a/src/stub.rs b/src/stub.rs
index feec1cf4..e756da4f 100644
--- a/src/stub.rs
+++ b/src/stub.rs
@@ -1,6 +1,7 @@
 use std::fs::File;
 use std::io;
 
+// A stable alternative to https://doc.rust-lang.org/stable/std/primitive.never.html
 enum Never {}
 
 pub struct MmapInner {