diff --git a/alpha/help/0409/index.htm b/alpha/help/0409/index.htm
index c7ddd64..1626680 100644
--- a/alpha/help/0409/index.htm
+++ b/alpha/help/0409/index.htm
@@ -51,7 +51,7 @@ There are command-line manuals in "<tt>help</tt>" folder.
 </table>
 
 <hr>
-<small>last update 2024/11/01 for version 1.3.3.4</small>
+<small>last update 2024/11/30 for version 1.3.3.4</small>
 
 </body>
 </html>
diff --git a/alpha/help/0409/readme1.htm b/alpha/help/0409/readme1.htm
index 7924430..c8b9d4a 100644
--- a/alpha/help/0409/readme1.htm
+++ b/alpha/help/0409/readme1.htm
@@ -31,7 +31,7 @@ Be careful to use those special features.
 
 <h3>System requirement</h3>
 <p>&nbsp
-MultiPar requires a PC with Windows Vista or later (Windows 7, 8, 10, 11).
+MultiPar requires a PC with Windows 7 or later (Windows 8, 10, 11).
 </p>
 
 <h3>Usage manual or Help documents</h3>