diff --git a/developer-guide/user-interfaces/README.md b/developer-guide/user-interfaces/README.md
index e5d6e3c..32372e0 100644
--- a/developer-guide/user-interfaces/README.md
+++ b/developer-guide/user-interfaces/README.md
@@ -39,6 +39,8 @@ This is a project that can run against the ACA Engine development environment,
 
 NB: If you are planning to run the user interface project without the ACAEngine Developer environment, in Step 6 above you will need to use `gulp serve --mock` this will allow the interface to run 'headless' with mock data for development purposes.
 
+NB: While the frontends are relatively plug'n'play with a locally spun up [ACAEngine environment](/developer-guide/getting-started), a domain must first be set for localhost or your machine's IP address before authentication will be functional. Ensure the domain that's set is the same as what you're accessing the frontend with and matches the composer config in [settings.json](/developer-guide/user-interfaces/settings-json).
+
 ## Angular Resources
 
 Angular is our preferred web application framework. We recommend being familiar with it before continuing.
diff --git a/developer-guide/user-interfaces/settings-json.md b/developer-guide/user-interfaces/settings-json.md
new file mode 100644
index 0000000..31328fe
--- /dev/null
+++ b/developer-guide/user-interfaces/settings-json.md
@@ -0,0 +1,9 @@
+# Settings.json file
+
+The settings.json file exists primarily to allow configurable settings that:
+
+* Directives for binding to Status variables
+* Calling functions in the Driver
+* Resource access \(database manipulation\)
+* Authentication with ACA Engine
+* Driver debug binding directives
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