diff --git a/Cloud-Tier.md b/Cloud-Tier.md
index c078146..74e66c4 100644
--- a/Cloud-Tier.md
+++ b/Cloud-Tier.md
@@ -29,7 +29,7 @@ Compared to direct S3 storage, this is both faster and cheaper!
   * Access old data from S3 with O(1) http call.
 
 ## Usage
-1. Use `weed scaffold -conf=master` to generate `master.toml`, tweak it, and start master server with the `master.toml`.
+1. Use `weed scaffold -config=master` to generate `master.toml`, tweak it, and start master server with the `master.toml`.
 1. Use `volume.tier.upload` in `weed shell` to move volumes to the cloud.
 1. Use `volume.tier.download` in `weed shell` to move volumes to the local cluster.