diff --git a/src/reason-parser/reason_oprint.mli b/src/reason-parser/reason_oprint.mli
new file mode 100644
index 000000000..9a0269d89
--- /dev/null
+++ b/src/reason-parser/reason_oprint.mli
@@ -0,0 +1,15 @@
+open Format
+open Reason_omp.Ast_414.Outcometree
+
+val print_ident : formatter -> out_ident -> unit
+val print_out_value : formatter -> out_value -> unit
+val print_out_label : formatter -> string * bool * out_type -> unit
+val print_out_type : formatter -> out_type -> unit
+val print_out_constr : formatter -> out_constructor -> unit
+val print_out_class_type : formatter -> out_class_type -> unit
+val print_out_module_type : formatter -> out_module_type -> unit
+val print_out_sig_item : formatter -> out_sig_item -> unit
+val print_out_signature : formatter -> out_sig_item list -> unit
+val print_out_type_extension : formatter -> out_type_extension -> unit
+val print_out_phrase : formatter -> out_phrase -> unit
+val parenthesized_ident : string -> bool