Add traceback.format_exc().
diff --git a/Misc/NEWS b/Misc/NEWS
index 1371e6c..c47ed15 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -101,6 +101,9 @@
 Library
 -------
 
+- traceback.format_exc has been added (similar to print_exc but it returns
+  a string).
+
 - xmlrpclib.MultiCall has been added.
 
 - poplib.POP3_SSL has been added.