diff --git a/Directories-and-Files.md b/Directories-and-Files.md
index 3c2e3b1..d8eda34 100644
--- a/Directories-and-Files.md
+++ b/Directories-and-Files.md
@@ -45,7 +45,8 @@ visit "http://localhost:8888/path/to/sources/?lastFileName=abc.txt&limit=50"
 
 ## Architecture
 
-Filer has a persistent client connecting to Master, to know the locations of all volumes.
+Filer has a persistent client connecting to Master, to get the location updates of all volumes.
+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.