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-rw-r--r--CHANGES.md2
-rw-r--r--UPGRADE.rst23
2 files changed, 13 insertions, 12 deletions
diff --git a/CHANGES.md b/CHANGES.md
index d9afcaa52b..265555bfc6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,7 +3,7 @@ Synapse 1.27.0 (2021-02-16)
 
 Note that this release includes a change in Synapse to use Redis as a cache ─ as well as a pub/sub mechanism ─ if Redis support is enabled for workers. No action is needed by server administrators, and we do not expect resource usage of the Redis instance to change dramatically.
 
-This release also changes the callback URI for OpenID Connect (OIDC) identity providers. If your server is configured to use single sign-on via an OIDC/OAuth2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
+This release also changes the callback URI for OpenID Connect (OIDC) and SAML2 identity providers. If your server is configured to use single sign-on via an OIDC/OAuth2 or SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
 
 This release also changes escaping of variables in the HTML templates for SSO or email notifications. If you have customised these templates, please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
 
diff --git a/UPGRADE.rst b/UPGRADE.rst
index 22edfe0d60..6f628a6947 100644
--- a/UPGRADE.rst
+++ b/UPGRADE.rst
@@ -88,20 +88,21 @@ for example:
 Upgrading to v1.27.0
 ====================
 
-Changes to callback URI for OAuth2 / OpenID Connect
----------------------------------------------------
+Changes to callback URI for OAuth2 / OpenID Connect and SAML2
+-------------------------------------------------------------
 
-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.
+This version changes the URI used for callbacks from OAuth2 and SAML2 identity providers:
 
-See `docs/openid.md <docs/openid.md>`_ for more information on setting up OpenID
-Connect.
+* 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.
 
-(Note: a similar change is being made for SAML2; in this case the old URI
-``[synapse public baseurl]/_matrix/saml2`` is being deprecated, but will continue to
-work, so no immediate changes are required for existing installations.)
+  See `docs/openid.md <docs/openid.md>`_ for more information on setting up OpenID
+  Connect.
+
+* If your server is configured for single sign-on via a SAML2 identity provider, you will
+  need to add ``[synapse public baseurl]/_synapse/client/saml2/authn_response`` as a permitted
+  "ACS location" (also known as "allowed callback URLs") at the identity provider.
 
 Changes to HTML templates
 -------------------------