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-rw-r--r--docs/development/contributing_guide.md6
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@@ -324,6 +324,12 @@ The above will run a monolithic (single-process) Synapse with SQLite as the data
 
 - Passing `POSTGRES=1` as an environment variable to use the Postgres database instead.
 - Passing `WORKERS=1` as an environment variable to use a workerised setup instead. This option implies the use of Postgres.
+  - If setting `WORKERS=1`, optionally set `WORKER_TYPES=` to declare which worker
+    types you wish to test. A simple comma-delimited string containing the worker types
+    defined from the `WORKERS_CONFIG` template in
+    [here](https://github.com/matrix-org/synapse/blob/develop/docker/configure_workers_and_start.py#L54).
+    A safe example would be `WORKER_TYPES="federation_inbound, federation_sender, synchrotron"`.
+    See the [worker documentation](../workers.md) for additional information on workers.
 
 To increase the log level for the tests, set `SYNAPSE_TEST_LOG_LEVEL`, e.g:
 ```sh