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@@ -100,6 +100,32 @@ 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`.
 
+
+## Deprecation of the `synapse.app.appservice` worker application type
+
+The `synapse.app.appservice` worker application type allowed you to configure a
+single worker to use to notify application services of new events, as long
+as this functionality was disabled on the main process with `notify_appservices: False`.
+
+To unify Synapse's worker types, the `synapse.app.appservice` worker application
+type and the `notify_appservices` configuration option have been deprecated.
+
+To get the same functionality, it's now recommended that the `synapse.app.generic_worker`
+worker application type is used and that the `notify_appservices_from_worker` option
+is set to the name of a worker.
+
+For the time being, `notify_appservices_from_worker` can be used alongside
+`synapse.app.appservice` and `notify_appservices` to make it easier to transition
+between the two configurations, however please note that:
+
+- the options must not contradict each other (otherwise Synapse won't start); and
+- the `notify_appservices` option will be removed in a future release of Synapse.
+
+Please see [the relevant section of the worker documentation][v1_59_notify_ases_from] for more information.
+
+[v1_59_notify_ases_from]: workers.md#notifying-application-services
+
+
 # Upgrading to v1.58.0
 
 ## Groups/communities feature has been disabled by default
@@ -107,6 +133,7 @@ homeserver config option to `true`.
 The non-standard groups/communities feature in Synapse has been disabled by default
 and will be removed in Synapse v1.61.0.
 
+
 # Upgrading to v1.57.0
 
 ## Changes to database schema for application services