Update README.md

IronTooch · web-flow · commit b7467c10e80e · 2020-04-01T23:44:24.000-04:00
diff --git a/docs/setup/README.md b/docs/setup/README.md
@@ -88,6 +88,7 @@ Then:
 docker-compose up -d
 ```
 
+The config file (config.json) must be present in this directory.
 
 ### Running on Raspberry PI / ARM devices
 
