Index: c-api/string.rst
===================================================================
--- c-api/string.rst	(revision 71891)
+++ c-api/string.rst	(working copy)
@@ -60,7 +60,13 @@
    *len* on success, and *NULL* on failure.  If *v* is *NULL*, the contents of the
    string are uninitialized.
 
+   .. note::
 
+      Prior to Python version 2.5, this function used an :ctype:`int` type for
+      *len*. This might require changes in your code for properly supporting
+      64-bit systems.
+
+
 .. cfunction:: PyObject* PyString_FromFormat(const char *format, ...)
 
    Take a C :cfunc:`printf`\ -style *format* string and a variable number of
@@ -134,7 +140,13 @@
 
    Return the length of the string in string object *string*.
 
+   .. note::
 
+      Prior to Python version 2.5, this function returned an :ctype:`int`
+      type. This might require changes in your code for properly supporting
+      64-bit systems.
+
+
 .. cfunction:: Py_ssize_t PyString_GET_SIZE(PyObject *string)
 
    Macro form of :cfunc:`PyString_Size` but without error checking.
@@ -202,7 +214,12 @@
    fails, the original string object at *\*string* is deallocated, *\*string* is
    set to *NULL*, a memory exception is set, and ``-1`` is returned.
 
+   .. note::
 
+      Prior to Python version 2.5, this function used an :ctype:`int` type for
+      *newsize*. This might require changes in your code for properly
+      supporting 64-bit systems.
+
 .. cfunction:: PyObject* PyString_Format(PyObject *format, PyObject *args)
 
    Return a new string object from *format* and *args*. Analogous to ``format %
Index: c-api/arg.rst
===================================================================
--- c-api/arg.rst	(revision 71893)
+++ c-api/arg.rst	(working copy)
@@ -401,6 +401,12 @@
 
       PyArg_ParseTuple(args, "O|O:ref", &object, &callback)
 
+   .. note::
+
+      Prior to Python version 2.5, this function used an :ctype:`int` type for
+      *min* and *max*. This might require changes in your code for properly
+      supporting 64-bit systems.
+
    .. versionadded:: 2.2
 
 
Index: c-api/dict.rst
===================================================================
--- c-api/dict.rst	(revision 71900)
+++ c-api/dict.rst	(working copy)
@@ -143,7 +143,13 @@
    Return the number of items in the dictionary.  This is equivalent to
    ``len(p)`` on a dictionary.
 
+   .. note::
 
+      Prior to Python version 2.5, this function returned an :ctype:`int`
+      type.  This might require changes in your code for properly supporting
+      64-bit systems.
+
+
 .. cfunction:: int PyDict_Next(PyObject *p, Py_ssize_t *ppos, PyObject **pkey, PyObject **pvalue)
 
    Iterate over all key-value pairs in the dictionary *p*.  The
@@ -187,7 +193,13 @@
           Py_DECREF(o);
       }
 
+   .. note::
 
+      Prior to Python version 2.5, this function used an :ctype:`int *` type
+      for *ppos*. This might require changes in your code for properly
+      supporting 64-bit systems.
+
+
 .. cfunction:: int PyDict_Merge(PyObject *a, PyObject *b, int override)
 
    Iterate over mapping object *b* adding key-value pairs to dictionary *a*.
Index: c-api/allocation.rst
===================================================================
--- c-api/allocation.rst	(revision 71891)
+++ c-api/allocation.rst	(working copy)
@@ -11,7 +11,13 @@
 
 .. cfunction:: PyVarObject* _PyObject_NewVar(PyTypeObject *type, Py_ssize_t size)
 
+   .. note::
 
+      Prior to Python version 2.5, this function used an :ctype:`int` type for
+      *size*. This might require changes in your code for properly supporting
+      64-bit systems.
+
+
 .. cfunction:: void _PyObject_Del(PyObject *op)