diff --git a/alpha/help/ReadMe1_English.txt b/alpha/help/ReadMe1_English.txt
index 732e438..ae69642 100644
--- a/alpha/help/ReadMe1_English.txt
+++ b/alpha/help/ReadMe1_English.txt
@@ -18,7 +18,7 @@ Parchive 1.0 client by Yutaka Sawada
  You cannot specify Non-Recovery-Set files. (Empty files are set.)
  Number of recovery files are limited to 99.
 
- This requires a PC of Windows Vista or later (Windows 7, 8, 10, 11).
+ This requires a PC of Windows 7 or later (Windows 8, 10, 11).
  This is developed with Visual Studio 2022 on Windows 10.
 
 
diff --git a/alpha/help/ReadMe2_English.txt b/alpha/help/ReadMe2_English.txt
index 7a16d95..255ba13 100644
--- a/alpha/help/ReadMe2_English.txt
+++ b/alpha/help/ReadMe2_English.txt
@@ -31,7 +31,7 @@ Parchive 2.0 client by Yutaka Sawada
  Verifying file use same memory as the file or double of block size.
  Recovering block use more memory as the number of block is many.
 
- This requires a PC of Windows Vista or later (Windows 7, 8, 10, 11).
+ This requires a PC of Windows 7 or later (Windows 8, 10, 11).
  This is developed with Visual Studio 2022 on Windows 10.