diff --git a/CHANGELOG.md b/CHANGELOG.md
index a1750c6..8a2a6d7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,7 +3,17 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
-- Initial template scaffolding
+### Added
+- CI workflow `ci.yml` (Python lint, required check = `build`).
+- Release workflow `release.yml` with prerelease tag + auto-notes.
+- Issue templates, PR template, SECURITY.md baseline.
+
+### Changed
+- Branch protection: PR required, force-push/deletes blocked, required check = `build`.
+- README: template usage note at top.
+
+### Fixed
+- Minor typos in CODEOWNERS and CONTRIBUTING.
 
 ## [0.0.1] - 2025-09-30
 - Initial release of template