diff --git a/src/proto/gui_beval.pro b/src/proto/gui_beval.pro
new file mode 100644
index 0000000..160b0e1
--- /dev/null
+++ b/src/proto/gui_beval.pro
@@ -0,0 +1,10 @@
+/* gui_beval.c */
+BalloonEval *gui_mch_create_beval_area __ARGS((void *target, char_u *mesg, void (*mesgCB)(BalloonEval *, int), void *clientData));
+void gui_mch_destroy_beval_area __ARGS((BalloonEval *beval));
+void gui_mch_enable_beval_area __ARGS((BalloonEval *beval));
+void gui_mch_disable_beval_area __ARGS((BalloonEval *beval));
+BalloonEval *gui_mch_currently_showing_beval __ARGS((void));
+int gui_mch_get_beval_info __ARGS((BalloonEval *beval, char_u **filename, int *line, char_u **text, int *idx));
+void gui_mch_post_balloon __ARGS((BalloonEval *beval, char_u *mesg));
+void gui_mch_unpost_balloon __ARGS((BalloonEval *beval));
+/* vim: set ft=c : */