diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 7099fa0..d7cb06b 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -366,7 +366,7 @@ loops that truncate the stream.
    The returned group is itself an iterator that shares the underlying iterable
    with :func:`groupby`.  Because the source is shared, when the :func:`groupby`
    object is advanced, the previous group is no longer visible.  So, if that data
-   is needed later, it should be stored as a list::
+   are needed later, they should be stored as a list::
 
       groups = []
       uniquekeys = []