diff --git a/README.txt b/README.txt
index 858506c..a32468d 100644
--- a/README.txt
+++ b/README.txt
@@ -1,6 +1,7 @@
 PROJECT EPOCH
 
-The goal of this project is to develop an Unity game within a day.
+The goal of this project is to develop an Unity game within a day.  It was
+developed with Unity 5.6.1.
 
 This is a game where the user can throw balls of energy at a target, in a manner
 inspired by the Spirit Bomb from the series Dragonball Z.