diff --git a/Cloud-Tier.md b/Cloud-Tier.md
index 5c99693..d39986b 100644
--- a/Cloud-Tier.md
+++ b/Cloud-Tier.md
@@ -18,7 +18,7 @@ If one volume is tiered to the cloud,
 
 ## Usage
 1. Use `weed scaffold -conf=master` to generate `master.toml`, tweak it, and start master server with the `master.toml`.
-1. Use `volume.tier` in `weed shell` to move volumes to the cloud.
+1. Use `volume.tier.upload` in `weed shell` to move volumes to the cloud.
 
 ## Configuring Storage Backend
 (Currently only s3 is developed. More is coming soon.)
@@ -36,9 +36,9 @@ After this is configured, you can use this command.
 
 ```
 // move the volume 37.dat to the s3 cloud
-volume.tier -dest=s3 -collection=benchmark -volumeId=37
+volume.tier.upload -dest=s3 -collection=benchmark -volumeId=37
 // or
-volume.tier -dest=s3.default -collection=benchmark -volumeId=37
+volume.tier.upload -dest=s3.default -collection=benchmark -volumeId=37
 
 ```