diff --git a/Directories-and-Files.md b/Directories-and-Files.md
index ebabec9..ae36cef 100644
--- a/Directories-and-Files.md
+++ b/Directories-and-Files.md
@@ -49,7 +49,7 @@ Filer has a persistent client connecting to Master, to get the location updates
 There are no network round trip to lookup the volume id location.
 
 For file reads:
-1. Filer lookup metadata from Filer Store, which can be Cassandra/Mysql/Postgres/Redis/LevelDB.
+1. Filer lookup metadata from Filer Store, which can be Cassandra/Mysql/Postgres/Redis/LevelDB/etcd.
 2. Filer read from volume servers and pass along to the read request.
 ![](FilerRead.png)
 
@@ -85,6 +85,7 @@ The Filer Store persists all file metadata and directory information.
 | Cassandra    | O(logN)| unlimited | Local or Distributed, Very Fast||Yes|                |
 | MySql        | O(logN)| unlimited | Local or Distributed, Fast     |Atomic| | Easy to manage, export |
 | Postgres     | O(logN)| unlimited | Local or Distributed, Fast     |Atomic| | Easy to manage, export |
+| Etcd     | O(logN)| ~10GB | Distributed, 10,000 writes/sec     || | No SPOF. High Availability.|
 
 #### Switching between different Stores
 It is easy to switch between different filer stores.