diff --git a/Source/lighting.cpp b/Source/lighting.cpp
index a57c1b3c1..17eaefc67 100644
--- a/Source/lighting.cpp
+++ b/Source/lighting.cpp
@@ -19,17 +19,23 @@ BOOL lightflag;
 //
 // n=4
 //
-//     1
-//    3#4
-//     2
+//    y
+//    ^
+//    |  1
+//    | 3#4
+//    |  2
+//    +-----> x
 //
 // n=16
 //
-//     314
-//    B7 8C
-//    F # G
-//    D9 AE
-//     526
+//    y
+//    ^
+//    |  314
+//    | B7 8C
+//    | F # G
+//    | D9 AE
+//    |  526
+//    +-------> x
 char CrawlTable[2749] = {
 	1,
 	0, 0,