1 files changed, 8 insertions, 0 deletions
diff --git a/docs/upgrade.md b/docs/upgrade.md
index 3ac2387e2a..adbd16fda5 100644
--- a/docs/upgrade.md
+++ b/docs/upgrade.md
@@ -125,6 +125,14 @@ environment variable.
See [using a forward proxy with Synapse documentation](setup/forward_proxy.md) for
details.
+## User-interactive authentication fallback templates can now display errors
+
+This may affect you if you make use of custom HTML templates for the
+[reCAPTCHA](../synapse/res/templates/recaptcha.html) or
+[terms](../synapse/res/templates/terms.html) fallback pages.
+
+The template is now provided an `error` variable if the authentication
+process failed. See the default templates linked above for an example.
# Upgrading to v1.39.0
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