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diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 7badbc3..d91c823 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -16,6 +16,13 @@ to this, the :mod:`multiprocessing` module allows the programmer to fully
leverage multiple processors on a given machine. It runs on both Unix and
Windows.
+.. warning::
+
+ Some of this package's functionality requires a functioning shared semaphore
+ implementation on the host operating system. Without one, the
+ :mod:`multiprocessing.synchronize` module will be disabled, and attempts to
+ import it will result in an :exc:`ImportError`. See
+ :issue:`3770` for additional information.
The :class:`Process` class
~~~~~~~~~~~~~~~~~~~~~~~~~~