diff --git a/CHANGELOG.md b/CHANGELOG.md
index 10b1bdb2a..5747cf8d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ Format based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+- `project.yaml` — technical project descriptor with version, architecture, simulation, and content model as the canonical version source of truth
+
 ## [v0.1.9] — 2026-02-18
 
 ### Fixed