diff --git a/API-Setup.md b/API-Setup.md
index 6f680d8..9cec05c 100644
--- a/API-Setup.md
+++ b/API-Setup.md
@@ -1,6 +1,6 @@
 # Setup
 
-This API is only used for the initial setup.
+This API is only used for the initial setup. It is only available if no config file is present.
 
 ## Get list of users
 `POST /setup`