diff --git a/Replication.md b/Replication.md
index 8473780..bc1bd60 100644
--- a/Replication.md
+++ b/Replication.md
@@ -1,4 +1,5 @@
-SeaweedFS can support replication. The replication is implemented not on file level, but on volume level.
+SeaweedFS blob storage can support replication, not implemented on file level, but on volume level.
+File level replication is in filer layer.
 
 ## How to use
 
@@ -94,4 +95,3 @@ In certain circumstances—like adding/removing/altering replication settings of
 ## Change replication
 
 In `weed shell`, you can change a volume replication setting via `volume.configure.replication`. After that, the volume will become readonly since the replication setting is not matched. You will also need to run 'volume.fix.replication` to create missing replicas.
-