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diff --git a/Doc/c-api/object.rst b/Doc/c-api/object.rst
index 6a538b340d..717fb089fe 100644
--- a/Doc/c-api/object.rst
+++ b/Doc/c-api/object.rst
@@ -108,6 +108,9 @@ Object Protocol
Python expression ``o1 op o2``, where ``op`` is the operator corresponding to
*opid*.
+.. note::
+ If *o1* and *o2* are the same object, :cfunc:`PyObject_RichCompareBool`
+ will always return ``1`` for :const:`Py_EQ` and ``0`` for :const:`Py_NE`.
.. cfunction:: int PyObject_Cmp(PyObject *o1, PyObject *o2, int *result)