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diff --git a/Doc/c-api/object.rst b/Doc/c-api/object.rst
index f377c75..9851825 100644
--- a/Doc/c-api/object.rst
+++ b/Doc/c-api/object.rst
@@ -257,6 +257,16 @@ is considered sufficient for this determination.
This is the equivalent of the Python expression ``hash(o)``.
+.. cfunction:: long PyObject_HashNotImplemented(PyObject *o)
+
+ Set a TypeError indicating that ``type(o)`` is not hashable and return ``-1``.
+ This function receives special treatment when stored in a ``tp_hash`` slot,
+ allowing a type to explicit indicate to the interpreter that it is not
+ hashable.
+
+ .. versionadded:: 2.6
+
+
.. cfunction:: int PyObject_IsTrue(PyObject *o)
Returns ``1`` if the object *o* is considered to be true, and ``0`` otherwise.