diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc5598bb..522223cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -129,6 +129,7 @@ It includes many new rules, including all new techniques introduced in MITRE ATT
 - main: implement file limitations via rules not code #390 @williballenthin
 - json: breaking change: correctly render negative offsets #619 @williballenthin
 - library: breaking change: remove logic from `__init__.py` throughout #622 @williballenthin
+- library: add type annotations for use with mypy #447 @williballenthin
 
 ### Development