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-rw-r--r--docs/development/contributing_guide.md5
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@@ -304,6 +304,11 @@ To run a specific test, you can specify the whole name structure:
 COMPLEMENT_DIR=../complement ./scripts-dev/complement.sh -run TestImportHistoricalMessages/parallel/Historical_events_resolve_in_the_correct_order
 ```
 
+The above will run a monolithic (single-process) Synapse with SQLite as the database. For other configurations, try:
+
+- 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.
+
 
 ### Access database for homeserver after Complement test runs.