diff --git a/upgrading/topics/keycloak/changes.adoc b/upgrading/topics/keycloak/changes.adoc
index f563548a23..8b94afda5f 100644
--- a/upgrading/topics/keycloak/changes.adoc
+++ b/upgrading/topics/keycloak/changes.adoc
@@ -35,6 +35,12 @@ a new account in Keycloak. This is because Instagram user IDs are not compatible
 new API temporarily returns both new and old user IDs to allow migration. Keycloak automatically migrates the ID once user
 logs in.
 
+==== Non-standard token introspection endpoint removed
+
+In previous versions, Keycloak advertized two introspection endpoints: `token_introspection_endpoint` and `introspection_endpoint`.
+The latter is the one defined by https://tools.ietf.org/html/rfc8414#section-2[RFC-8414]. The former, previously deprecated,
+has now been removed.
+
 === Migrating to 9.0.1
 
 ==== Legacy promise in JavaScript adapter