diff --git a/README.md b/README.md
index 523c50b..747debd 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,12 @@ Smux (***S***imple ***MU***ltiple***X***ing) is a multiplexing library for Golan
 ## Features
 
 1. Tiny, less than 500 LOC.
-2. Token controlled receive buffer, which provides smooth bandwidth usage curve.
+2. Token controlled receive buffer, which provides smooth bandwidth usage curve(see picture below).
 3. Receive buffer is own by session and is shared across streams.
 4. Minimized header(8Bytes), maxmized payload. 
 
+![smooth bandwidth curve](curve.jpg)
+
 ## Documentation
 
 For complete documentation, see the associated [Godoc](https://godoc.org/github.com/xtaci/smux).