diff --git a/concept/Levels.txt b/concept/Levels.txt
index 3cc4a88..6c2459b 100644
--- a/concept/Levels.txt
+++ b/concept/Levels.txt
@@ -32,3 +32,4 @@ Colour-stones, 10x10 matrix, 4 wells in each corner.
 
 *** Level 4 ***
 
+Lasers! And mirrors!