Added cross-references plus a note about dict & list shallow copying.
diff --git a/Doc/library/thread.rst b/Doc/library/thread.rst
index c9be598..ca70403 100644
--- a/Doc/library/thread.rst
+++ b/Doc/library/thread.rst
@@ -13,9 +13,11 @@
single: semaphores, binary
This module provides low-level primitives for working with multiple threads
-(a.k.a. :dfn:`light-weight processes` or :dfn:`tasks`) --- multiple threads of
+(also called :dfn:`light-weight processes` or :dfn:`tasks`) --- multiple threads of
control sharing their global data space. For synchronization, simple locks
-(a.k.a. :dfn:`mutexes` or :dfn:`binary semaphores`) are provided.
+(also called :dfn:`mutexes` or :dfn:`binary semaphores`) are provided.
+The :mod:`threading` module provides an easier to use and higher-level
+threading API built on top of this module.
.. index::
single: pthreads