diff --git a/source/conf.py b/source/conf.py
index fcbc796..ac29c31 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -61,7 +61,8 @@
 html_copy_source = False
 html_extra_path = [
     'sitemap.xml',
-    'googlecd24172c95f0d5b3.html'
+    'googlecd24172c95f0d5b3.html',
+    'ms72214890.txt'
 ]
 
 html_theme_options = {
diff --git a/source/ms72214890.txt b/source/ms72214890.txt
new file mode 100644
index 0000000..cc4eb33
--- /dev/null
+++ b/source/ms72214890.txt
@@ -0,0 +1,5 @@
+{
+  "Description": "Web サイトのルートにある Microsoft 365 のドメイン所有権確認ファイル",
+  "Domain": "flexconfirmmail.com",
+  "Id": "a9abc63e-5008-41b2-a638-b57a28cf54e4"
+}
\ No newline at end of file