diff --git a/docker/README.md b/docker/README.md
index d5879c2f2c..4b712f3f5c 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -89,6 +89,8 @@ The following environment variables are supported in run mode:
`/data`.
* `SYNAPSE_CONFIG_PATH`: path to the config file. Defaults to
`<SYNAPSE_CONFIG_DIR>/homeserver.yaml`.
+* `SYNAPSE_WORKER`: module to execute, used when running synapse with workers.
+ Defaults to `synapse.app.homeserver`, which is suitable for non-worker mode.
* `UID`, `GID`: the user and group id to run Synapse as. Defaults to `991`, `991`.
* `TZ`: the [timezone](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) the container will run with. Defaults to `UTC`.
diff --git a/docker/start.py b/docker/start.py
index 260f2d9943..e41ea20e70 100755
--- a/docker/start.py
+++ b/docker/start.py
@@ -182,6 +182,7 @@ def main(args, environ):
mode = args[1] if len(args) > 1 else None
desired_uid = int(environ.get("UID", "991"))
desired_gid = int(environ.get("GID", "991"))
+ synapse_worker = environ.get("SYNAPSE_WORKER", "synapse.app.homeserver")
if (desired_uid == os.getuid()) and (desired_gid == os.getgid()):
ownership = None
else:
@@ -245,7 +246,7 @@ def main(args, environ):
log("Starting synapse with config file " + config_path)
- args = ["python", "-m", "synapse.app.homeserver", "--config-path", config_path]
+ args = ["python", "-m", synapse_worker, "--config-path", config_path]
if ownership is not None:
args = ["su-exec", ownership] + args
os.execv("/sbin/su-exec", args)
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