diff --git a/src/map.rs b/src/map.rs
index 0cd0330..19f7dc6 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -12,6 +12,11 @@ u64 num_nodes
 for node_id in 1..num_nodes{
 	u64 parent_node
 }
+
+//NOTE: alternate realities are not necessary.
+//portals/wormholes simply use an in-model and and out-model.
+//skyboxes are inverted models with a special shader.
+
 //ideally spacial blocks are sorted from distance to start zone
 //texture blocks are inserted before the first spacial block they are used in
 u64 num_spacial_blocks