diff --git a/CHANGELOG.md b/CHANGELOG.md
index 930a338356..fcc1b9e69a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - CI changelog entry enforcer
 - `examples/periodic-at.rs`, an example of a periodic timer without accumulated drift.
 - `examples/periodic-at2.rs`, an example of a periodic process with two tasks, with offset timing. Here we depict two alternative usages of the timer type, explicit and trait based.
+- book: Update `Monotonic` tips.
 
 ## [v1.0.0] - 2021-12-25