diff --git a/TODO.md b/TODO.md
index 3706e55..0473792 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,6 +2,11 @@
 
 ## game data structure
 
+more colours? max 10? (0-9)
+colours not in palette can use modulo
+
+--
+
 add "move" functions for entities
 e.g. move(direction), teleport
 
@@ -30,6 +35,7 @@ idea:
     * re-use player avatar drawing function as generic image drawing function
     * text (how?)
     * support older graphics adaptors
+    * player has some graphical tearing on non-integer window sizes
 
 ### windows
 
@@ -54,3 +60,11 @@ will need:
 * build something in egui
 * can we do a web version that works with zip files?
     * investigate zip compression/decompression in rust
+
+## documentation
+
+where to find XMs?
+
+https://modarchive.org/index.php?request=view_by_license&query=publicdomain etc.
+keygenmusic.org?
+pouet.net or something?