Update README.md

README.md

@@ -10,5 +10,8 @@ Alternate Tuning Systems Library for Pure Data (Pd). The library is designed for
 ## A quick Pd tutorial
 - http://www.pd-tutorial.com/
 
+## What patch to open first?
+- _Main.pd
+
 # Notes
 To use meantoneTemperament.pd the [pd-zexy](https://github.com/iem-projects/pd-zexy) library is required. You can install the library by selecting "Help" > "Find externals" and searching for "zexy." Choose the version that is right for your system–for example if you are using a Mac: zexy[v2.3.1]\(Darwin-amd64-32\)–click on that version, and the library will be added to your Pd application.