diff --git a/collects/scribblings/foreign/types.scrbl b/collects/scribblings/foreign/types.scrbl
index d9b0d5d370..236d406d65 100644
--- a/collects/scribblings/foreign/types.scrbl
+++ b/collects/scribblings/foreign/types.scrbl
@@ -427,7 +427,7 @@ to specify wrapper arguments that are not sent to the foreign function
 (e.g., an argument that is used for processing the foreign output).}
 
 
-@defform/subs[#:literals (i io io)
+@defform/subs[#:literals (i o io)
               (_ptr mode type-expr)
               ([mode i o io])]{