diff --git a/README.md b/README.md
index b5be328..5ea90d3 100644
--- a/README.md
+++ b/README.md
@@ -6,3 +6,5 @@ This viewer project, formerly known as the Avination Viewer, is now open source.
 The project is in an early development stage. 
 
 You will need Unreal Engine 4 and the Unreal Editor source to do much with this.
+
+The code is updated with work with UE 4.21.