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-rwxr-xr-xdocker/start.py5
1 files changed, 3 insertions, 2 deletions
diff --git a/docker/start.py b/docker/start.py
index e41ea20e70..6e1cb807a1 100755
--- a/docker/start.py
+++ b/docker/start.py
@@ -217,8 +217,9 @@ def main(args, environ):
         # backwards-compatibility generate-a-config-on-the-fly mode
         if "SYNAPSE_CONFIG_PATH" in environ:
             error(
-                "SYNAPSE_SERVER_NAME and SYNAPSE_CONFIG_PATH are mutually exclusive "
-                "except in `generate` or `migrate_config` mode."
+                "SYNAPSE_SERVER_NAME can only be combined with SYNAPSE_CONFIG_PATH "
+                "in `generate` or `migrate_config` mode. To start synapse using a "
+                "config file, unset the SYNAPSE_SERVER_NAME environment variable."
             )
 
         config_path = "/compiled/homeserver.yaml"