diff --git a/Setup-Development-Environment.md b/Setup-Development-Environment.md
index c4b3926..5c974f2 100644
--- a/Setup-Development-Environment.md
+++ b/Setup-Development-Environment.md
@@ -6,6 +6,7 @@
 * [Git](https://git-scm.com/downloads)
 * [NodeJS](https://nodejs.org/en/download/) (Node 6.X.X or higher)
 * [Yarn](https://yarnpkg.com/)
+* .NET 4.6.1 or Mono equivalent. 
 
 ### Setup