Issue #8844: Regular and recursive lock acquisitions can now be interrupted
by signals on platforms using pthreads.  Patch by Reid Kleckner.
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index 282d705..371ac90 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -408,6 +408,9 @@
    .. versionchanged:: 3.2
       The *timeout* parameter is new.
 
+   .. versionchanged:: 3.2
+      Lock acquires can now be interrupted by signals on POSIX.
+
 
 .. method:: Lock.release()