diff --git a/harbour/ChangeLog.txt b/harbour/ChangeLog.txt
index 3a47a0d91a..32f3a9e8cf 100644
--- a/harbour/ChangeLog.txt
+++ b/harbour/ChangeLog.txt
@@ -10,6 +10,11 @@
      * Change, ! Fix, % Optimization, + Addition, - Removal, ; Comment
  */
 
+2013-01-30 21:08 UTC+0100 Viktor Szakats (harbour syenar.net)
+  * ChangeLog
+    + Added incompatible note to prev along with some analysis
+      and compatibility notes.
+
 2013-01-30 20:55 UTC+0100 Viktor Szakats (harbour syenar.net)
   * src/codepage/cpsviso.c
     ! fixed codepage from ISO-8859-1 to ISO-8859-15, which
@@ -18,6 +23,13 @@
       offending three chars are not part of the Swedish alphabet.
       So here I'm finishing and letting others to fix the rest
       if there is any.
+      [INCOMPATIBLE]
+      Reindex if you use "SVISO" CP. The three non-Swedish
+      chars are now represented in their proper location,
+      previously they were represented by their Windows-1252
+      codepoints. So another solution is if you switch to
+      "SVWIN" which was formerly identical to "SVISO", the
+      latter being wrong.
 
 2013-01-30 20:35 UTC+0100 Viktor Szakats (harbour syenar.net)
   * README.txt