diff --git a/Production-Setup.md b/Production-Setup.md
index 36948f1..a3266f5 100644
--- a/Production-Setup.md
+++ b/Production-Setup.md
@@ -156,7 +156,7 @@ Follow [[Amazon S3 API]] to generate a json config file, to assign accessKey and
 Start s3 together with filer. This avoids the setup for s3 to support multiple filers.
 
 ```
-weed filer -s3 -s3.config=<config.json> -port=8333
+weed filer -s3 -s3.config=<config.json> -s3.port=8333
 ```
 
 The endpoint is `http://<s3_server_host>:8333`.