diff --git a/README.md b/README.md
index c7d1df2..ff9c792 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,8 @@ shipit-secrets
 
 A simple secret inclusion task for shipit, inspired by capistrano.
 
+N.B.: This project uses ES6 features, and as such requires a relatively recent version of node.
+
 Usage
 =====