diff --git a/README.md b/README.md
index bfa1ed3..d326422 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-## CoinTiger SDK
+## CoinTiger SDK V1
 cointiger sdk contains restful apis and websocket apis for cointiger exchange
 
 ## Installation
@@ -111,4 +111,4 @@ cointiger_websocket.set_sub_type_dict(type_dict)
 cointiger_websocket.set_pairs(['btcusdt', 'ethusdt'])
 cointiger_websocket.tick_forever()
 
-```
\ No newline at end of file
+```