diff --git a/TODO.org b/TODO.org
index a9e037da..74c103ce 100644
--- a/TODO.org
+++ b/TODO.org
@@ -501,7 +501,8 @@ capturing value. Two things for it to know: a widening thunk's environment holds
 code pointer rather than a GC object, and capturing a dyn stays refused until a
 synthesised environment has a descriptor.
 
-** TODO CFn and C's calling convention
+** WAIT CFn and C's calling convention
+Decided 2026-09-25: waits with C callbacks, until a program needs one.
 A Flan function's signature ends with the transfer channel and a C caller knows
 nothing about one, so a =CFn= is not a C callback today. Under a future
 =--no-conditions= flag a =CFn= signature could drop the channel and reach C's