Issue #4129: Belatedly document which C API functions had their argument(s) or
return type changed from int or int * to Py_ssize_t or Py_ssize_t * as this
might cause problems on 64-bit platforms.
diff --git a/Doc/c-api/object.rst b/Doc/c-api/object.rst
index 79565e1..6a538b3 100644
--- a/Doc/c-api/object.rst
+++ b/Doc/c-api/object.rst
@@ -351,6 +351,10 @@
and mapping protocols, the sequence length is returned. On error, ``-1`` is
returned. This is the equivalent to the Python expression ``len(o)``.
+ .. versionchanged:: 2.5
+ These functions returned an :ctype:`int` type. This might require
+ changes in your code for properly supporting 64-bit systems.
+
.. cfunction:: PyObject* PyObject_GetItem(PyObject *o, PyObject *key)