diff --git a/Readme.md b/Readme.md
index a555e29..db57f20 100644
--- a/Readme.md
+++ b/Readme.md
@@ -5,6 +5,7 @@ This book was designed for easily diving into Rust，and it's very easy to use:
   
 ## Features
 
+- Read, Edit and Run the exercise ONLINE
 - There are three parts in each chapter: examples, exercises and practices
 - Covering nearly all aspects of Rust, such as **async/await, threads, sync primitives, optimizing and stand libraries** etc
 - Solution for each exercise