diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4691b735..5110cc5d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -99,6 +99,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Fixed bug in `IndexMap::truncate` that left the map in an inconsistent state.
 - Fixed clippy lints.
 - Fixed `{arc,box,object}_pool!` emitting clippy lints.
 - Fixed the list of implemented data structures in the crate docs, by adding `Deque`,