Fix misinformation about NaN != NaN comparison (GH-19357)
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
index 16542cd..8036a49 100644
--- a/Doc/reference/expressions.rst
+++ b/Doc/reference/expressions.rst
@@ -1422,8 +1422,9 @@
The not-a-number values ``float('NaN')`` and ``decimal.Decimal('NaN')`` are
special. Any ordered comparison of a number to a not-a-number value is false.
A counter-intuitive implication is that not-a-number values are not equal to
- themselves. For example, if ``x = float('NaN')``, ``3 < x``, ``x < 3``, ``x
- == x``, ``x != x`` are all false. This behavior is compliant with IEEE 754.
+ themselves. For example, if ``x = float('NaN')``, ``3 < x``, ``x < 3`` and
+ ``x == x`` are all false, while ``x != x`` is true. This behavior is
+ compliant with IEEE 754.
* ``None`` and ``NotImplemented`` are singletons. :PEP:`8` advises that
comparisons for singletons should always be done with ``is`` or ``is not``,