diff --git a/docs/.vitepress/config/constants.ts b/docs/.vitepress/config/constants.ts
index 4745fffb..38495f10 100644
--- a/docs/.vitepress/config/constants.ts
+++ b/docs/.vitepress/config/constants.ts
@@ -3,8 +3,8 @@ const site = 'https://note.toshiki.dev'
 
 // site metadatas with exports in use of global config
 export const metaData = {
-    lang: 'en',
-    locale: 'en',
+    lang: 'en-US',
+    locale: 'en-US',
     title: "Toshiki's Note",
     description: "Toshiki's web notebook served via Vitepress!",
     site,