Issue #7707: Documented that multiprocessing.Queue operations during
import can lead to deadlocks.
diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst
index 4f3f1cd..d611278 100644
--- a/Doc/library/multiprocessing.rst
+++ b/Doc/library/multiprocessing.rst
@@ -120,7 +120,9 @@
           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**