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diff --git a/CHANGES.md b/CHANGES.md
index 9837710d06..9476fef72d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -3,6 +3,8 @@ Synapse 1.xx.0 (2021-xx-xx)
Note that this release drops support for ARMv7 in the official Docker images, due to repeated problems building for ARMv7 (and the associated maintenance burden this entails).
+This release also fixes the documentation included in v1.27.0 around the callback URI for SAML2 identity providers. If your server is configured to use single sign-on via a SAML2 IdP, you may need to make configuration changes. Please review [UPGRADE.rst](UPGRADE.rst) for more details on these changes.
+
Removal warning
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