diff --git a/src/aeso_syntax.erl b/src/aeso_syntax.erl
index b3cc3ce..ddb95e5 100644
--- a/src/aeso_syntax.erl
+++ b/src/aeso_syntax.erl
@@ -25,7 +25,7 @@
 -type ann_origin() :: system | user.
 -type ann_format() :: '?:' | hex | infix | prefix | elif.
 
--type ann() :: [{line, ann_line()} | {col, ann_col()} | {format, ann_format()} | {origin, ann_origin()}].
+-type ann() :: [{line, ann_line()} | {col, ann_col()} | {format, ann_format()} | {origin, ann_origin()} | stateful | private].
 
 -type name() :: string().
 -type id()   :: {id,   ann(), name()}.