diff --git a/web/src/locales/ja.ts b/web/src/locales/ja.ts
index 690a5fd0d..46a5e8e53 100644
--- a/web/src/locales/ja.ts
+++ b/web/src/locales/ja.ts
@@ -332,6 +332,7 @@ export default {
       questionTip: `質問が指定されている場合、チャンクの埋め込みはそれらに基づきます。`,
     },
     chat: {
+      messagePlaceholder: 'メッセージを入力してください...',
       newConversation: '新しい会話',
       createAssistant: 'アシスタントを作成',
       assistantSetting: 'アシスタント設定',
diff --git a/web/src/pages/next-chats/chat/app-settings/chat-prompt-engine.tsx b/web/src/pages/next-chats/chat/app-settings/chat-prompt-engine.tsx
index 836073335..a5a635efa 100644
--- a/web/src/pages/next-chats/chat/app-settings/chat-prompt-engine.tsx
+++ b/web/src/pages/next-chats/chat/app-settings/chat-prompt-engine.tsx
@@ -31,7 +31,12 @@ export function ChatPromptEngine() {
           <FormItem>
             <FormLabel>{t('system')}</FormLabel>
             <FormControl>
-              <Textarea {...field} rows={8} />
+              <Textarea
+                {...field}
+                rows={8}
+                placeholder={t('messagePlaceholder')}
+                className="overflow-y-auto"
+              />
             </FormControl>
             <FormMessage />
           </FormItem>