diff --git a/api.rkt b/api.rkt
index fb4fdc1..e3f9381 100644
--- a/api.rkt
+++ b/api.rkt
@@ -64,7 +64,7 @@
 (struct question (name type class) #:transparent)
 
 ;; An AnsweredQuestion is an (answered-question Question
-;; CompleteAnswer).
+;; Maybe<CompleteAnswer>).
 (struct answered-question (q a) #:transparent)
 
 ;; A CompleteAnswer is a (complete-answer Set<RR> Set<RR> Set<RR>)