diff --git a/README.md b/README.md
index f0608434..aecdcbd3 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Demo of 4D coding
 
-## Java11
+## Project Setup
+
+Change demo4d-core to jdk8 to 11 to compile.
 
 Use the AdoptOpenJDK to run the demo.