diff --git a/pack-dist.ps1 b/pack-dist.ps1
index fe917b3..1e75d8e 100644
--- a/pack-dist.ps1
+++ b/pack-dist.ps1
@@ -303,8 +303,10 @@ does different jobs depending on which preset is lit.
 
 TRACKS.html is every track seen from above. The game has no track maps
 in it - the console had pictures and they did not survive - so each plan
-is drawn from the track's own scenery, placed where the game places it,
-with higher ground shown brighter.
+is drawn from the track's own scenery, placed where the game places it.
+Nearly every track is one wall bar repeated a few hundred times, and at
+this size a bar reads as a line rather than a box, so each is drawn as
+the single line it reads as.
 
 Four files here are yours. None of them ship - the game writes each one
 the first time it needs it and then leaves it alone, so a new build