diff --git a/src/proto/if_python3.pro b/src/proto/if_python3.pro
new file mode 100644
index 0000000..cca0430
--- /dev/null
+++ b/src/proto/if_python3.pro
@@ -0,0 +1,8 @@
+/* if_python.c */
+int python3_enabled __ARGS((int verbose));
+void python3_end __ARGS((void));
+void ex_python3 __ARGS((exarg_T *eap));
+void ex_py3file __ARGS((exarg_T *eap));
+void python3_buffer_free __ARGS((buf_T *buf));
+void python3_window_free __ARGS((win_T *win));
+/* vim: set ft=c : */