This is what a Custom object will contain. ``PyObject_HEAD`` is mandatory
at the start of each object struct and defines a field called ``ob_base``
of type :c:type:`PyObject`, containing a pointer to a type object and a
-reference count (these can be accessed using the macros :c:macro:`Py_REFCNT`
-and :c:macro:`Py_TYPE` respectively). The reason for the macro is to
+reference count (these can be accessed using the macros :c:macro:`Py_TYPE`
+and :c:macro:`Py_REFCNT` respectively). The reason for the macro is to
abstract away the layout and to enable additional fields in debug builds.
.. note::