diff --git a/Doc/library/2to3.rst b/Doc/library/2to3.rst
index 4c9a528d42e..1ab05a62ad4 100644
--- a/Doc/library/2to3.rst
+++ b/Doc/library/2to3.rst
@@ -288,7 +288,8 @@ and off individually.  They are described here in more detail.
 
    Fixes duplicate types in the second argument of :func:`isinstance`.  For
    example, ``isinstance(x, (int, int))`` is converted to ``isinstance(x,
-   (int))``.
+   int)`` and ``isinstance(x, (int, float, int))`` is converted to
+   ``isinstance(x, (int, float))``.
 
 .. 2to3fixer:: itertools_imports