diff --git a/README.md b/README.md
index 5a81691..e464d58 100644
--- a/README.md
+++ b/README.md
@@ -52,6 +52,8 @@ App example addition:
     }
 ```
 
+N.B. : You can now put `HEAD` as `revision`. This way, you won't have to come and update this file each time you change things in your app. *But* this also means that any change to your `master` branch will be made available to everybody. Hence, when developing things which are not production-ready, if you use `HEAD` we strongly recommend that you develop in a `testing` branch (for instance) until you consider things stable enough to be merged in `master`.
+
 #### Helper script
 
 You can use the <code>add_or_update.py</code> python script to add or update