diff --git a/README.md b/README.md
index 5b4f5f0..52d5308 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ board = ...
 ```
 
 ### Development version
-espressif Arduino repo branch master and latest compiled Arduino libs
+espressif Arduino repo branch release/v3.1.x and latest compiled Arduino libs
 
 ```ini
 [env:development]