Added prototype for PyErr_Format(exception, formatstring, ...) -> NULL.
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index 431d2e6..b29ec03 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -72,6 +72,7 @@
extern int PyErr_BadArgument Py_PROTO((void));
extern PyObject *PyErr_NoMemory Py_PROTO((void));
extern PyObject *PyErr_SetFromErrno Py_PROTO((PyObject *));
+extern PyObject *PyErr_Format Py_PROTO((PyObject *, const char *, ...));
extern void PyErr_BadInternalCall Py_PROTO((void));