diff --git a/CHANGELOG.md b/CHANGELOG.md
index 42ad42e..3374496 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@ A `### Breaking` section is used in addition to Keep a Changelog's standard sect
 
 ### Changed
 
+- Canonical changelog filename is now `CHANGELOG.md`, and action/code defaults were updated to match.
+
 ### Removed
 
 ### Fixed