diff --git a/Contributors.md b/Contributors.md
index 6abe660..f7c4a7d 100644
--- a/Contributors.md
+++ b/Contributors.md
@@ -3,3 +3,4 @@
 - [david-swift](https://github.com/david-swift)
 - [Greg Cotten](https://github.com/gregcotten)
 - [Zev Eisenberg](https://github.com/ZevEisenberg)
+- [Jay Wren](https://github.com/jrwren)
diff --git a/user-manual/Basics/HelloWorld.md b/user-manual/Basics/HelloWorld.md
index 57e3d49..0e63462 100644
--- a/user-manual/Basics/HelloWorld.md
+++ b/user-manual/Basics/HelloWorld.md
@@ -29,6 +29,12 @@ targets: [
 ]
 ```
 
+4. On macos you may need to set the platform version. Add the following after `name: "HelloWorld",`:
+
+```swift
+platforms: [.macOS(.v10_15)],
+```
+
 ## Create the App
 1. Navigate to `Sources/main.swift`.
 2. An app that uses the _Adwaita_ framework has a structure that conforms to the `App` protocol. The `scene` property returns one or more windows which provide content for display. An `@main` attribute marks it as the entry point of the app.