1 files changed, 2 insertions, 1 deletions
diff --git a/parser.sig b/parser.sig
index 7545f22..e3a1d3b 100644
--- a/parser.sig
+++ b/parser.sig
@@ -6,5 +6,6 @@ signature PARSER = sig
   type def
 
   val createParseCtx: string -> string list -> parseCtx
-  val parseDef: parseCtx -> def * parseCtx
+  val parseDef: parseCtx -> (def * parseCtx) option
+  val printDef: def -> unit
 end