diff --git a/TODO.txt b/TODO.txt
index 1cc3e7d..9d0a00b 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,3 +1,5 @@
+- try to compress images: store images as 4 bits per pixel + 16 color palette
+  (subset of the 256 color palette), check if performance stays ok
 - port to GB Meta
 - custom font
 - GUI