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@@ -89,6 +89,17 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.59.0
+
+## Device name lookup over federation has been disabled by default
+
+The names of user devices are no longer visible to users on other homeservers by default.
+Device IDs are unaffected, as these are necessary to facilitate end-to-end encryption.
+
+To re-enable this functionality, set the
+[`allow_device_name_lookup_over_federation`](https://matrix-org.github.io/synapse/v1.59/usage/configuration/config_documentation.html#federation)
+homeserver config option to `true`.
+
 # Upgrading to v1.58.0
 
 ## Groups/communities feature has been disabled by default