diff --git a/README.md b/README.md
index c595a1aa..a5fd7472 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,9 @@ Let's Encrypt client and ACME library written in Go.
 ## Features
 
 - ACME v2 [RFC 8555](https://www.rfc-editor.org/rfc/rfc8555.html)
-- Support [RFC 8738](https://www.rfc-editor.org/rfc/rfc8738) (issues certificates for IP addresses)
+  - Support [RFC 8737](https://www.rfc-editor.org/rfc/rfc8737.html): TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
+  - Support [RFC 8738](https://www.rfc-editor.org/rfc/rfc8738.html): certificates for IP addresses
+  - Support [draft-ietf-acme-ari-01](https://datatracker.ietf.org/doc/draft-ietf-acme-ari/): Renewal Information (ARI) Extension
 - Register with CA
 - Obtain certificates, both from scratch or with an existing CSR
 - Renew certificates
diff --git a/docs/content/_index.md b/docs/content/_index.md
index 483b4e86..a0e20523 100644
--- a/docs/content/_index.md
+++ b/docs/content/_index.md
@@ -12,7 +12,9 @@ Let's Encrypt client and ACME library written in Go.
 ## Features
 
 - ACME v2 [RFC 8555](https://www.rfc-editor.org/rfc/rfc8555.html)
-- Support [RFC 8738](https://www.rfc-editor.org/rfc/rfc8738) (issues certificates for IP addresses)
+  - Support [RFC 8737](https://www.rfc-editor.org/rfc/rfc8737.html): TLS Application‑Layer Protocol Negotiation (ALPN) Challenge Extension
+  - Support [RFC 8738](https://www.rfc-editor.org/rfc/rfc8738.html): issues certificates for IP addresses
+  - Support [draft-ietf-acme-ari-01](https://datatracker.ietf.org/doc/draft-ietf-acme-ari/): Renewal Information (ARI) Extension
 - Register with CA
 - Obtain certificates, both from scratch or with an existing CSR
 - Renew certificates