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diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 5635c70..0126831 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1140,6 +1140,10 @@ available. They are listed here in alphabetical order.
sequence argument, it returns an iterator of 1-tuples. With no arguments, it
returns an empty iterator.
+ The left-to-right evaluation order of the iterables is guaranteed. This
+ makes possible an idiom for clustering a data series into n-length groups
+ using ``zip(*[iter(s)]*n)``.
+
.. rubric:: Footnotes