NEWS

--- a/NEWS	Mon Dec 26 22:17:10 2011 +0100
+++ b/NEWS	Tue Dec 27 09:15:26 2011 +0100
@@ -53,6 +53,8 @@
 
 *** HOL ***
 
+* Finite_Set.fold now qualified.  INCOMPATIBILITY.
+
 * Renamed some facts on canonical fold on lists, in order to avoid problems
 with interpretation involving corresponding facts on foldl with the same base names: