bytearrays are mutable sequences
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 068f0fd..3d7e0be 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -368,12 +368,20 @@
comma-separated list of expressions in square brackets. (Note that there are no
special cases needed to form lists of length 0 or 1.)
+ Byte Arrays
+ .. index:: bytearray
+
+ A bytearray object is a mutable array. They are created by the built-in
+ :func:`bytearray` constructor. Aside from being mutable (and hence
+ unhashable), byte arrays otherwise provide the same interface and
+ functionality as immutable bytes objects.
+
.. index:: module: array
The extension module :mod:`array` provides an additional example of a mutable
sequence type.
-Set types
+Set types../
.. index::
builtin: len
object: set type