diff --git a/Super-Large-Directories.md b/Super-Large-Directories.md
index bc8d469..48f2a2b 100644
--- a/Super-Large-Directories.md
+++ b/Super-Large-Directories.md
@@ -8,9 +8,11 @@ This is actually a common case when user name, id, or UUID are used as sub folde
 
 We need a way to spread the data to all data nodes, without sacrificing too much.
 
+In a sense, we want SeaweedFS to be as efficient and scalable as a hybrid of distributed key value store, while still using the file system API for many common operations.
+
 # How it works?
 
-This is currently only implemented in Cassandra and Redis. In Cassandra, each entry has this schema:
+This is currently implemented in Cassandra and Redis. In Cassandra, each entry has this schema:
 ```
   CREATE TABLE filemeta (
      directory varchar,