diff --git a/README.md b/README.md
index 34f4ec6..2d1c7ba 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,20 @@
-# gfxg  
+# 573controller
 
-gfxg allows you to use an Arduino Leonardo or Micro to transform a GH/573 guitar into a USB game controller
-
-## Build Guide
-
-gfxg can be built with Arduino IDE 1.6.6 and above  
-
-Requires [Arduino Joystick Library](https://github.com/MHeironimus/ArduinoJoystickLibrary) to be installed
+This repository houses several .ino files for use with an Arduino. Supported music game controllers include:
+* _gfxg 
 
+Allows you to use an Arduino Leonardo or Micro to transform a Guitar Hero/GuitarFreaks/Gitadora guitar into a USB game controller
+* _iidx
 
+Allows you to use an Arduino Leonardo or Micro to transform an IIDX controller into a USB game controller with full support for [beatmania IIDX INFINITAS](https://p.eagate.573.jp/game/eac2dx/infinitas).
+* _iidx_2p
 
+Similar to _iidx but with buttons remapped from E1/E2 to E3/E4 for use with doubles play (DP).
 
+## Requirements
+* Arduino Leonardo or Micro
+* [Arduino Joystick Library](https://github.com/MHeironimus/ArduinoJoystickLibrary)
 
+If you are using _iidx, it additionally requires:
+* [Quadrature Encoder Library for Arduino](https://github.com/PaulStoffregen/Encoder)
+* Replacement of `boards.txt` located in your `Arduino/hardware/avr` directory. This modifies the pid (Product ID) and vid (Vendor ID) for [beatmania IIDX INFINITAS](https://p.eagate.573.jp/game/eac2dx/infinitas) to accept in-game input.