diff --git a/docs/project-example-v2/src/common.ztl b/docs/project-example-v2/src/common.ztl
index 1cb670f..6746457 100644
--- a/docs/project-example-v2/src/common.ztl
+++ b/docs/project-example-v2/src/common.ztl
@@ -16,4 +16,4 @@ type :Player {
    Color :color,
 };
 
-Color :purple {255 255 0};
+set :purple to immutable Color {255 255 0};