diff --git a/README.md b/README.md
index c06d914..4d343db 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,10 @@ flutter run
 
 New to Flutter? See [Getting Started](/documentation/GETTING_STARTED.md) for full setup and run instructions.
 
+Each example app is split into a wrapper and focused code. `lib/main.dart` sets up
+the `MaterialApp`, and `lib/example.dart` contains the code that demonstrates the
+concept. Open `lib/example.dart` to see what the app teaches.
+
 ## Documentation
 
 - [Example Apps](/documentation/EXAMPLES.md): all examples in this repository
diff --git a/documentation/CONTRIBUTING.md b/documentation/CONTRIBUTING.md
index 0c8047d..3899194 100644
--- a/documentation/CONTRIBUTING.md
+++ b/documentation/CONTRIBUTING.md
@@ -2,6 +2,23 @@
 
 I welcome and encourage all pull requests. It usually takes 24-48 hours to respond to any issue or request.
 
+## Example app structure
+
+Every example app uses the same structure, so the code that teaches a concept is
+easy to find:
+
+- `lib/main.dart`: the app wrapper. It holds only `runApp()` and a `MyApp` widget
+  that returns the `MaterialApp` (title, theme, routes). Keep this file minimal and
+  uniform across apps.
+- `lib/example.dart`: the focused example code. It contains the full screen
+  (`Scaffold` + `AppBar`) and the widget that demonstrates the concept, with a
+  `// Example: <what this app teaches>` comment at the top.
+- Supporting files (screens, tabs, services, models, widgets, utils) sit alongside
+  the example and are imported by `lib/example.dart`.
+
+To understand an example app, read `lib/example.dart`. That file holds the concept;
+`lib/main.dart` holds only the wrapping boilerplate.
+
 ## Basic rules
 
 1. Match coding style (braces, spacing, etc.). Use the `Reformat Code` feature of Android Studio (`CMD` + `Option` + `L` on Mac, `CTRL` + `ALT` + `L` on Linux and Windows).
@@ -11,3 +28,7 @@ I welcome and encourage all pull requests. It usually takes 24-48 hours to respo
 1. Check for existing [issues](https://github.com/nisrulz/flutter-examples/issues) before filing a new one.
 1. Follow the same standard as all other projects in this repo.
    > The package name must conform to the format: `github.nisrulz.<app_name>`
+
+When you add a new example app, keep the wrapper in `lib/main.dart` and the focused
+example code in `lib/example.dart`. Run `make docs`, `make analyze`, and `make doctor`
+before opening a pull request.
diff --git a/documentation/GETTING_STARTED.md b/documentation/GETTING_STARTED.md
index 2de314f..20c66db 100644
--- a/documentation/GETTING_STARTED.md
+++ b/documentation/GETTING_STARTED.md
@@ -30,6 +30,14 @@ cd simple_material_app
 flutter run
 ```
 
+## Where to look for the example code
+
+Every example app is split into two files:
+
+- `lib/main.dart`: the app wrapper. It only sets up the `MaterialApp` (title, theme, routes).
+- `lib/example.dart`: the focused example code. This file teaches the concept the
+  app demonstrates. Open it to see how the feature works.
+
 ## Useful links
 
 - [Flutter Widgets Catalog](https://flutter.dev/widgets/)