diff --git a/README.md b/README.md
index 9810e86..7af961e 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,10 @@ boundary and constraints that framework work must preserve.
 
 ## Release Guidance
 
+The [v0.21.0 release notes](docs/releases/v0.21.0.md) cover ConfigKit v1.2.0
+and main-relative companion imports through the existing configuration-source
+API.
+
 The [v0.20.0 release notes](docs/releases/v0.20.0.md) cover resolved resource
 inspection, generic JSON/YAML reports, typed prompt sources, and backend
 inheritance. Upgrading consumers should review the changed inspection result