diff --git a/content/ja/docs/reference/access-authn-authz/authentication.md b/content/ja/docs/reference/access-authn-authz/authentication.md
index 8b13ffef54..c99dc4c67a 100644
--- a/content/ja/docs/reference/access-authn-authz/authentication.md
+++ b/content/ja/docs/reference/access-authn-authz/authentication.md
@@ -214,7 +214,7 @@ sequenceDiagram
     deactivate kube
     activate api
     api ->> api: 5. JWT署名は有効か?
-    api ->> api: 6. JWTの有効期限はどうか?(iat+exp)
+    api ->> api: 6. JWTは期限切れでないか?(iat+exp)
     api ->> api: 7. ユーザ認可はどうか?
     api -->> kube: 8. 認可後:アクションを実行して結果を返却
     deactivate api