Add versionchanged notes for PEP 380
diff --git a/Doc/library/exceptions.rst b/Doc/library/exceptions.rst
index a9a16d3..3f1a30d 100644
--- a/Doc/library/exceptions.rst
+++ b/Doc/library/exceptions.rst
@@ -261,6 +261,9 @@
    raised, and the value returned by the function is used as the
    :attr:`value` parameter to the constructor of the exception.
 
+   .. versionchanged:: 3.3
+      Added ``value`` attribute and the ability for generator functions to
+      use it to return a value.
 
 .. exception:: SyntaxError