README.md in deliver-0.7.7 vs README.md in deliver-0.7.8

@@ -106,9 +106,15 @@
 
 ```
 ipa build && deliver testflight
 ```
 
+You can pass the "What to Test" value using the environment variable `DELIVER_WHAT_TO_TEST`:
+
+```
+DELIVER_WHAT_TO_TEST="Try the brand new project button" deliver testflight
+```
+
 # Quick Start
 
 
 The guide will create all the necessary files for you, using the existing app metadata from iTunes Connect.