diff --git a/TODO.txt b/TODO.txt
index 0ce43a7..87c32c5 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,5 +1,7 @@
 general:
 
+- SDL: handle the quit signal so that the program can be closed by closing the
+  window.
 - Refactor.
 - Port to ncurses?
 - Rewrite python scripts to C (faster, less bloat).