diff --git a/Production-Setup.md b/Production-Setup.md
index b27e9af..f79b329 100644
--- a/Production-Setup.md
+++ b/Production-Setup.md
@@ -176,7 +176,7 @@ Run
 
 * `-chunkCacheCountLimit` means how many entries cached in memory, default to 1000. With default `-chunkSizeLimitMB` set to 4, it may take up to 4x1000 MB memory. If all files are bigger than 4MB.
 * `-replication` is the replication level for each file. It overwrites replication settings on both filer and master.
-* `-outsideContainerClusterMode` is used if running master, volume server, and filer inside a cluster, and the volume server IP addresses are not visible to FUSE clients. If so, the volume servers accessed through the `publicUrl` address when starting with `weed volume -publicUrl=xxx`.
+* `-outsideContainerClusterMode` is used if master, volume server, and filer are inside a cluster, but `weed mount` is outside of the cluster. With this option, only filer needs to be exposed to outside. All read write access to volume servers will be proxied by filer.
 
 ## Cluster Maintenance