diff --git a/Doc/library/decimal.rst b/Doc/library/decimal.rst
index d8ce673..7c03b6a 100644
--- a/Doc/library/decimal.rst
+++ b/Doc/library/decimal.rst
@@ -364,6 +364,24 @@
    compared, sorted, and coerced to another type (such as :class:`float` or
    :class:`long`).
 
+   Decimal objects cannot generally be combined with floats in
+   arithmetic operations: an attempt to add a :class:`Decimal` to a
+   :class:`float`, for example, will raise a :exc:`TypeError`.
+   There's one exception to this rule: it's possible to use Python's
+   comparison operators to compare a :class:`float` instance ``x``
+   with a :class:`Decimal` instance ``y``.  Without this exception,
+   comparisons between :class:`Decimal` and :class:`float` instances
+   would follow the general rules for comparing objects of different
+   types described in the :ref:`expressions` section of the reference
+   manual, leading to confusing results.
+
+   .. versionchanged:: 2.7
+      A comparison between a :class:`float` instance ``x`` and a
+      :class:`Decimal` instance ``y`` now returns a result based on
+      the values of ``x`` and ``y``.  In earlier versions ``x < y``
+      returned the same (arbitrary) result for any :class:`Decimal`
+      instance ``x`` and any :class:`float` instance ``y``.
+
    In addition to the standard numeric properties, decimal floating point
    objects also have a number of specialized methods: