Fix typo.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 4a0714e..40ec9e8 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -60,7 +60,7 @@
:class:`Iterable`, and ``__len__`` ``index``, and ``count``
:class:`Container`
-:class:`MutableSequnce` :class:`Sequence` ``__getitem__`` Inherited Sequence methods and
+:class:`MutableSequence` :class:`Sequence` ``__getitem__`` Inherited Sequence methods and
``__delitem__``, ``append``, ``reverse``, ``extend``, ``pop``,
``insert``, ``remove``, and ``__iadd__``
and ``__len__``