diff --git a/docs/todo.md b/docs/todo.md
index ce739a7..6a5a36c 100644
--- a/docs/todo.md
+++ b/docs/todo.md
@@ -1,5 +1,19 @@
 # To do
 
+## Bug: skill "aura" effects are not drawn
+
+Reported 2026-10-14: the aura effects of some skills are missing. Not
+investigated yet. Things to check first:
+
+- whether vanilla (`[widescreen] Enabled=0`) draws them, i.e. whether the
+  widescreen or HUD patches cause it;
+- whether they are missing everywhere or only away from the screen centre;
+  if the latter, a clip test still using 1024x768 bounds, like the creature
+  clip (`0x4c8`/`0x3c8`) was;
+- effect objects (`cObjectFX`) in the object passes (`cWorldView0::DrawObjects`
+  `0x62e580` / `DrawObjects2` `0x6300d0`) and the light/effect list
+  (`+0xce14`, `0x41b1xx`).
+
 ## Better pathfinder (mouse clicks and monsters)
 
 Replace the game's pathfinding with a more reliable and efficient one, for