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-rw-r--r--Doc/library/concurrent.futures.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/concurrent.futures.rst b/Doc/library/concurrent.futures.rst
index c9f6aa1..0432fcd 100644
--- a/Doc/library/concurrent.futures.rst
+++ b/Doc/library/concurrent.futures.rst
@@ -444,7 +444,8 @@ Module Functions
.. function:: wait(fs, timeout=None, return_when=ALL_COMPLETED)
Wait for the :class:`Future` instances (possibly created by different
- :class:`Executor` instances) given by *fs* to complete. Returns a named
+ :class:`Executor` instances) given by *fs* to complete. Duplicate futures
+ given to *fs* are removed and will be returned only once. Returns a named
2-tuple of sets. The first set, named ``done``, contains the futures that
completed (finished or cancelled futures) before the wait completed. The
second set, named ``not_done``, contains the futures that did not complete