diff --git a/README.md b/README.md
index a52d89f..df120d3 100644
--- a/README.md
+++ b/README.md
@@ -76,7 +76,7 @@ Please do your pull request to the [testing branch](https://github.com/YunoHost-
 
 To try the testing branch, please proceed like that.
 ```
-sudo yunohost app install https://github.com/YunoHost-Apps/REPLACEBYYOURAPP_ynh/tree/testing
+sudo yunohost app install https://github.com/YunoHost-Apps/REPLACEBYYOURAPP_ynh/tree/testing --debug
 or
-sudo yunohost app upgrade REPLACEBYYOURAPP -u https://github.com/YunoHost-Apps/REPLACEBYYOURAPP_ynh/tree/testing
+sudo yunohost app upgrade REPLACEBYYOURAPP -u https://github.com/YunoHost-Apps/REPLACEBYYOURAPP_ynh/tree/testing --debug
 ```