Updates prerequisite instructions

README.md

@@ -6,6 +6,18 @@ These scripts have currently been tested on:
 * Ubuntu 18.04
 
 
+## Prerequisites
+Scripts in this repository require the Android SDK, see [Android SDK installation instructions](https://www.androidcentral.com/installing-android-sdk-windows-mac-and-linux-tutorial) for installation details. Once installed, export the SDK's path to the `ANDROID_HOME` environment variable, for example:
+```
+export ANDROID_HOME=/path/to/Android/Sdk/
+```
+
+To run `package_name.sh`, you will need `aapt` installed in `/usr/bin/`:
+```
+sudo apt install aapt
+```
+
+
 ## TL;DR
 Clone the repository and update submodules:
 ```
@@ -33,13 +45,6 @@ $ ./shortcut.sh com.android.chrome "Chrome"
 The file `chrome_shortcut.apk` should then appear in the same directory.
 
 
-## Dependencies
-Scripts in this repository require the Android SDK, see [Android SDK installation instructions](https://www.androidcentral.com/installing-android-sdk-windows-mac-and-linux-tutorial) for installation details. Once installed, export the SDK's path to the `ANDROID_HOME` environment variable, for example:
-```
-export ANDROID_HOME=/path/to/Android/Sdk/
-```
-
-
 ## Usage
 ### package_name.sh
 Returns an APK's the package-name.