diff --git a/README.md b/README.md
index 4596e859..9e8cf207 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,9 @@ App is available to download at following stores:
 
 **Warning**: All three versions (Google Play, F-Droid and the APKs) are not
 compatible (not signed by the same key)! You must uninstall one to install
-the other, which will delete all your data.
+the other, which will delete all your data.  
+
+If you want to use the version downloaded from F-Droid or form Github with **Android Auto**, you must enable Unknown Sources as it is described in [this wiki page](https://github.com/ultrasonic/ultrasonic/wiki/Using-Ultrasonic-with-Android-Auto).
 
 ## Bugs and issues