NEWS;

--- a/NEWS	Sat Sep 30 13:13:55 2017 +0200
+++ b/NEWS	Sat Sep 30 13:14:01 2017 +0200
@@ -22,6 +22,12 @@
     with a solver other than Z3. INCOMPATIBILITY.
 
 
+*** System ***
+
+* Windows and Cygwin is for x86_64 only. Old 32bit platform support has
+been discontinued.
+
+
 New in Isabelle2017 (October 2017)
 ----------------------------------