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@@ -88,6 +88,17 @@ for example:
 Upgrading to v1.27.0
 ====================
 
+Changes to callback URI for OAuth2 / OpenID Connect
+---------------------------------------------------
+
+This version changes the URI used for callbacks from OAuth2 identity providers. If
+your server is configured for single sign-on via an OpenID Connect or OAuth2 identity
+provider, you will need to add ``[synapse public baseurl]/_synapse/client/oidc/callback``
+to the list of permitted "redirect URIs" at the identity provider.
+
+See `docs/openid.md <docs/openid.md>`_ for more information on setting up OpenID
+Connect.
+
 Changes to HTML templates
 -------------------------
 
@@ -235,7 +246,7 @@ shown below:
 
           return {"localpart": localpart}
 
-Removal historical Synapse Admin API 
+Removal historical Synapse Admin API
 ------------------------------------
 
 Historically, the Synapse Admin API has been accessible under: