diff --git a/goblins/scribblings/api.scrbl b/goblins/scribblings/api.scrbl
index 80329b9..ec34cfa 100644
--- a/goblins/scribblings/api.scrbl
+++ b/goblins/scribblings/api.scrbl
@@ -84,7 +84,7 @@ Goblins' extensions to these ideas are:
           introducing coroutines.}}
   @item{Raw message passing without a clear way to get values back can
         be painful.
-        For this reason, @racket[<-] implicitly returns a promise that
+        For this reason, @racket[<-], implicitly returns a promise that
         can be resolved with @racket[on] (and, for extra convenience and
         fewer round trips, supports
         @secref["promise pipelining (tutorial)"]).@actors-note{