diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index a01ebbd..22dbbef 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -122,7 +122,9 @@ processes:
           print q.get()    # prints "[42, None, 'hello']"
           p.join()
 
-   Queues are thread and process safe.
+   Queues are thread and process safe, but note that they must never
+   be instantiated as a side effect of importing a module: this can lead
+   to a deadlock!  (see :ref:`threaded-imports`)
 
 **Pipes**