diff --git a/ReadMe.md b/ReadMe.md
index c3b24e645cd..841def74678 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -19,7 +19,7 @@ Welcome to [Kotlin](http://kotlinlang.org/)! Some handy links:
 
 ## Building
 
-To build this project, first time you try to build you need to run this (requires Apache Ant 1.8 or higher):
+To build this project, first time you try to build you need to run this (requires Apache **Ant 1.8** or higher and **JDK 1.6**):
 
     ant -f update_dependencies.xml