diff --git a/docs/tile_layer_draw_order.md b/docs/tile_layer_draw_order.md
index 4af464e..71c9ede 100644
--- a/docs/tile_layer_draw_order.md
+++ b/docs/tile_layer_draw_order.md
@@ -1,5 +1,7 @@
 # Tile Layer Draw Order
 
+Layer 1 is the "main" layer. Most of the map geometry should be placed in layer 1.
+
 The tile layers (layer 0 to 6) are drawn in this order:
 
 (with layer 0 being the furthest in the back and layer 2 at the front)