diff --git a/README.md b/README.md
index 3066e66..01f97b2 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,7 @@
 This repository is a place to share materials and examples for the IETF 124 hackathon.
 
 Please feel free to clone and make pull requests, or ask for direct commit privileges on this repo.
+
+# Additional reading
+
+A Deployment Profile for DKIM2 via Milter Interface (IETF Datatracker):  [https://datatracker.ietf.org/doc/draft-moccia-dkim2-deployment-profile/](https://datatracker.ietf.org/doc/draft-moccia-dkim2-deployment-profile/)