diff --git a/frontend/src/pages/settings/SubscriptionFormatsTab.tsx b/frontend/src/pages/settings/SubscriptionFormatsTab.tsx
index 056b14789..b3884bf9d 100644
--- a/frontend/src/pages/settings/SubscriptionFormatsTab.tsx
+++ b/frontend/src/pages/settings/SubscriptionFormatsTab.tsx
@@ -361,6 +361,7 @@ export default function SubscriptionFormatsTab({
                   <SettingListItem
                     paddings="small"
                     title={t('pages.settings.subFormats.concurrency')}
+                    description={t('pages.settings.subFormats.concurrencyHint')}
                   >
                     <InputNumber
                       value={muxObj.concurrency}
diff --git a/frontend/src/pages/xray/outbounds/transport/mux.tsx b/frontend/src/pages/xray/outbounds/transport/mux.tsx
index 690010da6..9548d6eb3 100644
--- a/frontend/src/pages/xray/outbounds/transport/mux.tsx
+++ b/frontend/src/pages/xray/outbounds/transport/mux.tsx
@@ -26,6 +26,7 @@ export default function MuxForm({ protocol, network, flow = '' }: MuxFormProps)
         <>
           <FormField
             label={t('pages.settings.subFormats.concurrency')}
+            tooltip={t('pages.settings.subFormats.concurrencyHint')}
             name={['mux', 'concurrency']}
           >
             <InputNumber min={-1} max={1024} />
diff --git a/internal/web/translation/ar-EG.json b/internal/web/translation/ar-EG.json
index 20f87bc26..e152133e2 100644
--- a/internal/web/translation/ar-EG.json
+++ b/internal/web/translation/ar-EG.json
@@ -1439,6 +1439,7 @@
         "applyTo": "تطبيق على",
         "addNoise": "+ ضوضاء",
         "concurrency": "التزامن",
+        "concurrencyHint": "عدد الـstreams في كل اتصال. xray-core 26.11.9 والأحدث بيرفع أي قيمة من 0 لـ128 إلى 128؛ النسخ الأقدم بتستخدم الرقم زي ما هو (0 يعني 8). القيمة ‎-1‏ بتقفل الـmux على TCP.",
         "xudpConcurrency": "تزامن xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/en-US.json b/internal/web/translation/en-US.json
index 711e767f1..05599684a 100644
--- a/internal/web/translation/en-US.json
+++ b/internal/web/translation/en-US.json
@@ -1564,6 +1564,7 @@
         "applyTo": "Apply to",
         "addNoise": "+ Noise",
         "concurrency": "Concurrency",
+        "concurrencyHint": "Streams per connection. xray-core 26.11.9 and newer raise any value from 0 to 128 to 128; older cores use the number as written (0 means 8). -1 turns TCP mux off.",
         "xudpConcurrency": "xudp concurrency",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/es-ES.json b/internal/web/translation/es-ES.json
index 303e09f4b..8ea61b93b 100644
--- a/internal/web/translation/es-ES.json
+++ b/internal/web/translation/es-ES.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Aplicar a",
         "addNoise": "+ Ruido",
         "concurrency": "Concurrencia",
+        "concurrencyHint": "Flujos por conexión. xray-core 26.11.9 y posteriores elevan a 128 cualquier valor entre 0 y 128; los núcleos anteriores usan el número tal cual (0 significa 8). -1 desactiva el mux TCP.",
         "xudpConcurrency": "Concurrencia xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/fa-IR.json b/internal/web/translation/fa-IR.json
index 6f99bce5d..7ab61bd43 100644
--- a/internal/web/translation/fa-IR.json
+++ b/internal/web/translation/fa-IR.json
@@ -1443,6 +1443,7 @@
         "applyTo": "اعمال بر",
         "addNoise": "+ نویز",
         "concurrency": "هم‌زمانی",
+        "concurrencyHint": "تعداد استریم در هر اتصال. xray-core 26.11.9 و جدیدتر هر مقدار بین ۰ تا ۱۲۸ را به ۱۲۸ می‌رساند؛ هسته‌های قدیمی‌تر همان عدد را به کار می‌برند (۰ یعنی ۸). مقدار ‎-1‏ ماکس TCP را خاموش می‌کند.",
         "xudpConcurrency": "هم‌زمانی xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/id-ID.json b/internal/web/translation/id-ID.json
index 2a2a03407..d08644082 100644
--- a/internal/web/translation/id-ID.json
+++ b/internal/web/translation/id-ID.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Terapkan ke",
         "addNoise": "+ Noise",
         "concurrency": "Konkurensi",
+        "concurrencyHint": "Jumlah stream per koneksi. xray-core 26.11.9 dan yang lebih baru menaikkan nilai 0 sampai 128 menjadi 128; core yang lebih lama memakai angka apa adanya (0 berarti 8). -1 mematikan mux TCP.",
         "xudpConcurrency": "Konkurensi xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/ja-JP.json b/internal/web/translation/ja-JP.json
index bdef5c00f..f1f84a9a2 100644
--- a/internal/web/translation/ja-JP.json
+++ b/internal/web/translation/ja-JP.json
@@ -1439,6 +1439,7 @@
         "applyTo": "適用先",
         "addNoise": "+ ノイズ",
         "concurrency": "並行数",
+        "concurrencyHint": "1 接続あたりのストリーム数。xray-core 26.11.9 以降は 0〜128 の値をすべて 128 に引き上げます。それより古いコアは指定した数値をそのまま使います（0 は 8）。-1 で TCP mux を無効にします。",
         "xudpConcurrency": "xudp 並行数",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/pt-BR.json b/internal/web/translation/pt-BR.json
index eccd461d1..8e4a29bc1 100644
--- a/internal/web/translation/pt-BR.json
+++ b/internal/web/translation/pt-BR.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Aplicar a",
         "addNoise": "+ Ruído",
         "concurrency": "Concorrência",
+        "concurrencyHint": "Fluxos por conexão. O xray-core 26.11.9 e posteriores elevam para 128 qualquer valor de 0 a 128; núcleos mais antigos usam o número como está (0 significa 8). -1 desativa o mux TCP.",
         "xudpConcurrency": "Concorrência xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/ru-RU.json b/internal/web/translation/ru-RU.json
index 59920df0b..fae67a37a 100644
--- a/internal/web/translation/ru-RU.json
+++ b/internal/web/translation/ru-RU.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Применить к",
         "addNoise": "+ Шум",
         "concurrency": "Параллелизм",
+        "concurrencyHint": "Число потоков на соединение. xray-core 26.11.9 и новее поднимает любое значение от 0 до 128 до 128; более старые ядра используют число как есть (0 означает 8). -1 отключает TCP-mux.",
         "xudpConcurrency": "Параллелизм xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/sk-SK.json b/internal/web/translation/sk-SK.json
index f2f42cdca..0b5a38bfe 100644
--- a/internal/web/translation/sk-SK.json
+++ b/internal/web/translation/sk-SK.json
@@ -1564,6 +1564,7 @@
         "applyTo": "Použiť na",
         "addNoise": "+ Šum",
         "concurrency": "Počet súbežných prenosov",
+        "concurrencyHint": "Počet streamov na jedno spojenie. xray-core 26.11.9 a novšie zvýšia každú hodnotu od 0 do 128 na 128; staršie jadrá použijú číslo tak, ako je zadané (0 znamená 8). -1 vypne TCP mux.",
         "xudpConcurrency": "Súbežné prenosy xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/tr-TR.json b/internal/web/translation/tr-TR.json
index 9f7154927..0909deae6 100644
--- a/internal/web/translation/tr-TR.json
+++ b/internal/web/translation/tr-TR.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Şuna Uygula",
         "addNoise": "+ Gürültü",
         "concurrency": "Eşzamanlılık",
+        "concurrencyHint": "Bağlantı başına akış sayısı. xray-core 26.11.9 ve sonrası 0 ile 128 arasındaki her değeri 128'e yükseltir; daha eski çekirdekler sayıyı yazıldığı gibi kullanır (0, 8 demektir). -1 TCP mux'u kapatır.",
         "xudpConcurrency": "xudp eşzamanlılık",
         "xudpUdp443": "UDP 443"
       },
diff --git a/internal/web/translation/uk-UA.json b/internal/web/translation/uk-UA.json
index b74c40b06..acac29f67 100644
--- a/internal/web/translation/uk-UA.json
+++ b/internal/web/translation/uk-UA.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Застосувати до",
         "addNoise": "+ Шум",
         "concurrency": "Паралельність",
+        "concurrencyHint": "Кількість потоків на з'єднання. xray-core 26.11.9 і новіші піднімають будь-яке значення від 0 до 128 до 128; старіші ядра використовують число як є (0 означає 8). -1 вимикає TCP-mux.",
         "xudpConcurrency": "Паралельність xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/vi-VN.json b/internal/web/translation/vi-VN.json
index d43b7a156..0e2a172bf 100644
--- a/internal/web/translation/vi-VN.json
+++ b/internal/web/translation/vi-VN.json
@@ -1439,6 +1439,7 @@
         "applyTo": "Áp dụng cho",
         "addNoise": "+ Nhiễu",
         "concurrency": "Đồng thời",
+        "concurrencyHint": "Số luồng trên mỗi kết nối. xray-core 26.11.9 trở lên nâng mọi giá trị từ 0 đến 128 thành 128; các core cũ hơn dùng đúng con số đã nhập (0 nghĩa là 8). -1 tắt mux TCP.",
         "xudpConcurrency": "Đồng thời xudp",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/zh-CN.json b/internal/web/translation/zh-CN.json
index 503743ee9..3fd3cae64 100644
--- a/internal/web/translation/zh-CN.json
+++ b/internal/web/translation/zh-CN.json
@@ -1439,6 +1439,7 @@
         "applyTo": "应用于",
         "addNoise": "+ 噪声",
         "concurrency": "并发",
+        "concurrencyHint": "每个连接承载的流数量。xray-core 26.11.9 及更新版本会把 0 到 128 之间的值一律提高到 128；更早的核心按填写的数值使用（0 表示 8）。-1 关闭 TCP mux。",
         "xudpConcurrency": "xudp 并发",
         "xudpUdp443": "xudp UDP 443"
       },
diff --git a/internal/web/translation/zh-TW.json b/internal/web/translation/zh-TW.json
index 5e6bed66d..deda19386 100644
--- a/internal/web/translation/zh-TW.json
+++ b/internal/web/translation/zh-TW.json
@@ -1439,6 +1439,7 @@
         "applyTo": "套用至",
         "addNoise": "+ 雜訊",
         "concurrency": "並發",
+        "concurrencyHint": "每個連線承載的串流數量。xray-core 26.11.9 及更新版本會把 0 到 128 之間的值一律提高到 128；更早的核心依填寫的數值使用（0 表示 8）。-1 關閉 TCP mux。",
         "xudpConcurrency": "xudp 並發",
         "xudpUdp443": "xudp UDP 443"
       },