diff --git a/sc2/TODO b/sc2/TODO
index 9453e1895..1897debdd 100644
--- a/sc2/TODO
+++ b/sc2/TODO
@@ -83,6 +83,8 @@ Glitches (don't crash the game, medium priority):
   isn't restored when loading.
 - When exiting from planet surface with lander, the 3d planet isn't updated
   for a little moment which causes black track on planet to be seen
+  - Or, perhaps more probably, the background image isn't drawn properly
+    (and thus the planet there is some old buffer remains for that moment)
 - Moving crosshair in planet screen leaves a light trace to the image
   in OpenGL mode (SDL surface format conversion problem)
 - You seem to be able to do certain things before you're supposed to