Add entry for Barrier objects.
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
index 7f0628d..f50c2ac 100644
--- a/Doc/library/threading.rst
+++ b/Doc/library/threading.rst
@@ -868,7 +868,7 @@
       constructor.
 
       The return value is an integer in the range 0 to *parties* -- 1, different
-      for each thrad.  This can be used to select a thread to do some special
+      for each thread.  This can be used to select a thread to do some special
       housekeeping, e.g.::
 
          i = barrier.wait()