diff --git a/src/proto/hangulin.pro b/src/proto/hangulin.pro
new file mode 100644
index 0000000..adfde14
--- /dev/null
+++ b/src/proto/hangulin.pro
@@ -0,0 +1,9 @@
+/* hangulin.c */
+int hangul_input_state_get __ARGS((void));
+void hangul_input_state_set __ARGS((int state));
+int im_get_status __ARGS((void));
+void hangul_input_state_toggle __ARGS((void));
+void hangul_keyboard_set __ARGS((void));
+int hangul_input_process __ARGS((char_u *s, int len));
+void hangul_input_clear __ARGS((void));
+/* vim: set ft=c : */