diff --git a/modules/game/level.scm b/modules/game/level.scm
index 5990a0d..ffe34bd 100644
--- a/modules/game/level.scm
+++ b/modules/game/level.scm
@@ -93,6 +93,7 @@
                             ;; electric-switch
                             ;; electron-warp
                             ((or 8 12 14) 5)
+                            ;; logic gates
                             ((or 11 13 15) 4)
                             (_ 3)))))
             (when obj