diff --git a/README.md b/README.md
index 4dfd806..a35c771 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,12 @@
 # mGB Waveform Editor
 
 This tool allows one to replace the waveform that is selected in the WAV channel. It sends a custom
-SysEx message so you will need an ArduinoBoy.
+SysEx message to mGB, so you will need:
 
-I have not tested it in RetroPlug, but if VSTs allow SysEx, then that would be possible too.
+1. A custom mGB built from [this branch](https://github.com/tstirrat/mGB/pull/6)
+1. An ArduinoBoy or some way to send MIDI to the mGB cart
+
+I have not tested it in RetroPlug, in theory it should work.
 
 ### Running the development server