diff --git a/setup.md b/setup.md
index f3d56a03b07..201a3798ec8 100644
--- a/setup.md
+++ b/setup.md
@@ -5,6 +5,11 @@ nav_title: Flutter Setup
 permalink: /setup/
 ---
 
+(Please remember, Flutter is in _technology preview_. Thanks
+for trying it out, and please don't hesitate to
+[file issues or bugs](https://github.com/flutter/flutter/issues/new)
+for us.)
+
 This guide describes how to set up your development environment to run Flutter apps on
 iOS or Android.
 
@@ -24,6 +29,9 @@ To install and run Flutter, your development environment must meet these minimum
 
 ## iOS setup
 
+_This step is optional, and can be performed at any time before
+using Flutter to develop apps for iOS._
+
 To develop Flutter apps for iOS, you need a Mac with Xcode 7.2 or newer:
 
 1. Install Xcode 7.2 or newer (via [web download](https://developer.apple.com/xcode/) or
@@ -64,6 +72,9 @@ iOS devices.
 
 ## Android setup
 
+_This step is optional, and can be performed at any time before
+using Flutter to develop apps for Android._
+
 To develop Flutter apps for Android, you can use either a Mac or a Linux (64-bit) machine:
 
 1. Install [Android Studio](https//developer.android.com/sdk/index.html).
@@ -127,4 +138,4 @@ Before creating your Flutter project in Atom, you’ll need to perform these pre
 2. Open **Packages > Flutter > Package Settings**, and set the **FLUTTER_ROOT** field to the
 root directory where you installed the Flutter SDK.
 3. Open **Packages > Dart > Package Settings**, and set the **Dart SDK Location** field to the
-`bin/cache/dart-sdk` directory in your Flutter SDK’s root folder.
\ No newline at end of file
+`bin/cache/dart-sdk` directory in your Flutter SDK’s root folder.