diff --git a/java/libraries/opengl/examples/Form/Toroid/Toroid.pde b/java/libraries/opengl/examples/Form/Toroid/Toroid.pde
index f79a8d174..4e03b01f4 100755
--- a/java/libraries/opengl/examples/Form/Toroid/Toroid.pde
+++ b/java/libraries/opengl/examples/Form/Toroid/Toroid.pde
@@ -1,3 +1,6 @@
+// Strange "lights flashing" effect, particularly noticeable at low res (pts=10, segments=20)
+// ...some problem with the automatic normal calculation maybe?
+
 /**
  * Interactive Toroid
  * by Ira Greenberg.