Expand Cupertino library comment (#64979)

ba78539b · Tim Sneath · GitHub · 28de49e3 · ba78539b
Unverified Commit ba78539b authored Sep 01, 2020 by Tim Sneath Committed by GitHub Sep 01, 2020
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cupertino.dart packages/flutter/lib/cupertino.dart +5 -0

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--- a/packages/flutter/lib/cupertino.dart
+++ b/packages/flutter/lib/cupertino.dart
@@ -8,6 +8,11 @@
 ///
 /// To use, import `package:flutter/cupertino.dart`.
 ///
+/// This library is designed for apps that run on iOS. For apps that may also
+/// run on other operating systems, we encourage use of other widgets, for
+/// example the [Material
+/// Design](https://flutter.dev/docs/development/ui/widgets/material) set.
+///
 /// {@youtube 560 315 https://www.youtube.com/watch?v=3PdUaidHc-E}
 library cupertino;