diff --git a/mods/bg_tree/fall_leaves.lua b/mods/bg_tree/fall_leaves.lua
index 9995c20..cc1f7d0 100644
--- a/mods/bg_tree/fall_leaves.lua
+++ b/mods/bg_tree/fall_leaves.lua
@@ -25,6 +25,7 @@ blockgame.register_abm({
 		end, 3)
 
 		if not is_supported then
+			-- TODO: become randomly-sized leaves pile when layered leaves is added.
 			minetest.set_node(pos, {name = modname .. ":leaves"})
 			minetest.check_for_falling(pos)
 			-- TODO: send out event here that makes nearby leaves check if they're unsupported as well?