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diff --git a/UPGRADE.rst b/UPGRADE.rst

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+Upgrading to v0.4.0
+===================
+
+This release needs an updated syutil version. Run::
+
+    python setup.py develop
+
+You will also need to upgrade your configuration as the signing key format has
+changed. Run::
+
+    python -m synapse.app.homeserver --config-path <CONFIG> --generate-config
+
+
 Upgrading to v0.3.0
 ===================