Start with no cars so the first one is added on purpose.

README.md

@@ -6,6 +6,8 @@ Pressures are PSI. Tire heat is °F, read inside, middle, then outside.
 
 ## On the phone
 
+The phone starts with no cars. Add one from the home screen, or paste a token from another phone.
+
 The gear icon opens **Car**. A new install already has the server address filled in:
 
 `http://sync.sleepingliongames.com:27017`