NEWS

--- a/NEWS	Tue Aug 18 10:25:13 1998 +0200
+++ b/NEWS	Tue Aug 18 10:27:14 1998 +0200
@@ -227,7 +227,8 @@
 
 *** ZF ***
 
-* theory Main includes everything;
+* theory Main includes everything; INCOMPATIBILITY: theory ZF.thy contains
+  only the theorems proved on ZF.ML;
 
 * ZF INCOMPATIBILITY: rule `equals0D' is now called `equals0E' (the old name
   was misleading).  The rule and 'sym RS equals0E' are now in the default