diff --git a/wit/types.wit b/wit/types.wit
index 6d92a88..4f77f23 100644
--- a/wit/types.wit
+++ b/wit/types.wit
@@ -43,6 +43,7 @@ interface types {
   type fields = u32
   drop-fields: func(fields: fields)
   new-fields: func(entries: list<tuple<string,list<u8>>>) -> fields
+  // Returns an empty list if `name` is not present.
   fields-get: func(fields: fields, name: string) -> list<list<u8>>
   fields-set: func(fields: fields, name: string, value: list<list<u8>>)
   fields-delete: func(fields: fields, name: string)