Update index.md

docs/index.md

@@ -4,20 +4,35 @@ layout: default
 
 # Defold In-app purchase extension API documentation
 
-This extension provides functions for making in-app purchases. Supported on iOS, Android (Google Play and Amazon) and Facebook Canvas. On Google Play the extension supports Billing 3.0.
+This extension provides functions for making in-app purchases.
 
-# Usage
+
-To use this library in your Defold project, add the following URL to your <code class="inline-code-block">game.project</code> dependencies:
+## Usage
+To use this library in your Defold project, add the following URL to your `game.project` dependencies:
 
     https://github.com/defold/extension-iap/archive/master.zip
 
 We recommend using a link to a zip file of a [specific release](https://github.com/defold/extension-iap/releases).
 
+For Facebook Canvas you also need to add the [Facebook extension as a dependency](https://github.com/defold/extension-facebook).
+
+
 ## Source code
 
 The source code is available on [GitHub](https://github.com/defold/extension-iap)
 
-## Differences between supported platforms
+
+## Supported platforms
+
+The following platforms are supported by the extension:
+
+* iOS - StoreKit
+* Google Play - Billing 3.0.0
+* Amazon - 2.0.61
+* Facebook Canvas
+
+
+### Differences between supported platforms
 
 Amazon supports two different product types: subscriptions and consumable products.
 
@@ -29,7 +44,7 @@ Calls to `iap.buy()` and `iap.set_listener()` will return all non-finished purch
 
 The concept of restoring purchases does not exist on Google Play/Amazon. Calls to `iap.restore()` on iOS will return all purchased products (and have product state set to TRANS_STATE_RESTORED). Calls to `iap.restore()` on Google Play will return all non-finished purchases (and have product state set to TRANS_STATE_PURCHASED).
 
-###
+---
 
 # API reference