diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index df39c28cc98..3c602c8a25f 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -243,6 +243,11 @@ Fundamental data types
 | :class:`c_ulonglong` | :c:type:`unsigned __int64` or            | int                        |
 |                      | :c:type:`unsigned long long`             |                            |
 +----------------------+------------------------------------------+----------------------------+
+| :class:`c_size_t`    | :c:type:`size_t`                         | int                        |
++----------------------+------------------------------------------+----------------------------+
+| :class:`c_ssize_t`   | :c:type:`ssize_t` or                     | int                        |
+|                      | :c:type:`Py_ssize_t`                     |                            |
++----------------------+------------------------------------------+----------------------------+
 | :class:`c_float`     | :c:type:`float`                          | float                      |
 +----------------------+------------------------------------------+----------------------------+
 | :class:`c_double`    | :c:type:`double`                         | float                      |