diff --git a/README.md b/README.md
index eeccdc5..672e9e7 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@
 * supported extensions:
   * RFC 7250 (raw public keys)
   * RFC 8879 (certificate compression)
-  * Encrypted SNI (wg-draft-02)
+  * Encrypted Client Hello ([wg-draft-15](https://datatracker.ietf.org/doc/draft-ietf-tls-esni/))
 
 Primary goal of the project is to create a fast, tiny, low-latency TLS 1.3 implementation that can be used with the HTTP/2 protocol stack and the upcoming QUIC stack of the [H2O HTTP/2 server](https://h2o.examp1e.net).