diff --git a/README.md b/README.md
index 6422e27d7a41ff8bb4535a60a13b7d9a11d9dd1d..2c328b720b4123859ab53103329d12812ee7363d 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ print(fetch_map)
 
 
 
-### Document
+## Document
 
 [Design Doc(Chinese)](doc/DESIGN.md)