diff --git a/algebra/one_shot.v b/algebra/one_shot.v
index 65a96aa4dfb545ae030d80201e1af39b46ccaa00..14cb69b265f4f393cbef4f5078fbc71b8f35906a 100644
--- a/algebra/one_shot.v
+++ b/algebra/one_shot.v
@@ -3,6 +3,7 @@ From iris.algebra Require Import upred.
 Local Arguments validN _ _ _ !_ /.
 Local Arguments valid _ _  !_ /.
 
+(* TODO: Really, we should have sums, and then this should be just "excl unit + A". *)
 Inductive one_shot {A : Type} :=
   | OneShotPending : one_shot
   | Shot : A → one_shot