Update C API docs for PEP 393.
diff --git a/Doc/c-api/long.rst b/Doc/c-api/long.rst
index b2295e0..4c295fa 100644
--- a/Doc/c-api/long.rst
+++ b/Doc/c-api/long.rst
@@ -100,6 +100,20 @@
string is first encoded to a byte string using :c:func:`PyUnicode_EncodeDecimal`
and then converted using :c:func:`PyLong_FromString`.
+ .. deprecated-removed:: 3.3 4.0
+ Part of the old-style :c:type:`Py_UNICODE` API; please migrate to using
+ :c:func:`PyLong_FromUnicodeObject`.
+
+
+.. c:function:: PyObject* PyLong_FromUnicodeObject(PyObject *u, int base)
+
+ Convert a sequence of Unicode digits in the string *u* to a Python integer
+ value. The Unicode string is first encoded to a byte string using
+ :c:func:`PyUnicode_EncodeDecimal` and then converted using
+ :c:func:`PyLong_FromString`.
+
+ .. versionadded:: 3.3
+
.. c:function:: PyObject* PyLong_FromVoidPtr(void *p)