diff --git a/i2p2www/spec/proposals/144-ecies-x25519-aead-ratchet.rst b/i2p2www/spec/proposals/144-ecies-x25519-aead-ratchet.rst
index d4db3b22..de25edca 100644
--- a/i2p2www/spec/proposals/144-ecies-x25519-aead-ratchet.rst
+++ b/i2p2www/spec/proposals/144-ecies-x25519-aead-ratchet.rst
@@ -2167,6 +2167,9 @@ References
 .. [RFC-2104]
     https://tools.ietf.org/html/rfc2104
 
+.. [RFC-5869]
+    https://tools.ietf.org/html/rfc5869
+
 .. [RFC-7539]
     https://tools.ietf.org/html/rfc7539