diff --git a/src/net/torvald/terrarum/StateTestingSandbox.kt b/src/net/torvald/terrarum/StateTestingSandbox.kt
index b8fbbc0b7..fa88a07ab 100644
--- a/src/net/torvald/terrarum/StateTestingSandbox.kt
+++ b/src/net/torvald/terrarum/StateTestingSandbox.kt
@@ -68,6 +68,9 @@ class StateTestingSandbox : BasicGameState() {
         //g.drawLine(lightning_start, lightning_end)
         //bolt.draw(g)
 
+        // TODO rotational transformmation for the points
+        // (newX, newY) = (x cos(theta) - y sin(theta), x sin(theta) + y cos(theta))
+
 
         val ampY = 40f
         val ampX = 3