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-rw-r--r--Doc/library/collections.abc.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/library/collections.abc.rst b/Doc/library/collections.abc.rst
index 5f7888a..99c4311 100644
--- a/Doc/library/collections.abc.rst
+++ b/Doc/library/collections.abc.rst
@@ -134,7 +134,7 @@ particular functionality, for example::
Several of the ABCs are also useful as mixins that make it easier to develop
classes supporting container APIs. For example, to write a class supporting
-the full :class:`Set` API, it only necessary to supply the three underlying
+the full :class:`Set` API, it is only necessary to supply the three underlying
abstract methods: :meth:`__contains__`, :meth:`__iter__`, and :meth:`__len__`.
The ABC supplies the remaining methods such as :meth:`__and__` and
:meth:`isdisjoint`::