diff --git a/.env.example b/.env.example
index 77a13fa..ac67526 100644
--- a/.env.example
+++ b/.env.example
@@ -83,12 +83,10 @@ BACKPACK_DEBUG=false
 # Provide the EVM private key & wallet address for onboarded accounts.
 # When EXCHANGE=paradex these values are used automatically.
 
+PARADEX_SYMBOL=BTC-USD-PERP
 PARADEX_PRIVATE_KEY=
 PARADEX_WALLET_ADDRESS=
 
-# Symbol defaults to TRADE_SYMBOL if omitted. Use ccxt unified format like BTC-USD-PERP.
-# PARADEX_SYMBOL=BTC-USD-PERP
-
 # Enable testnet endpoints by setting to "true"; defaults to false (mainnet).
 # PARADEX_SANDBOX=false
 
diff --git a/README.md b/README.md
index 128247f..99d7c27 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,13 @@
 # ritmex-bot
 
-基于 Bun 的 Aster 永续合约量化终端，内置趋势跟随（SMA30）与做市策略，支持快速恢复、实时行情订阅与日志追踪。
+基于 Bun 的 DEX 永续合约量化终端，内置趋势跟随（SMA30）与做市策略，支持快速恢复、实时行情订阅与日志追踪。
 
 * [Aster 30% 手续费优惠注册链接](https://www.asterdex.com/zh-CN/referral/4665f3)
 * [Binance 手续费优惠注册链接](https://www.binance.com/join?ref=KNKCA9XC)
 * [GRVT 手续费优惠注册链接](https://grvt.io/exchange/sign-up?ref=sea)
 * [Backpack 手续费优惠注册链接](https://backpack.exchange/join/41d60948-2a75-4d16-b7e9-523df74f2904)
 * [edgex 手续费优惠注册链接](https://pro.edgex.exchange/referral/BULL)
+* [Paradex 手续费优惠注册链接](https://paradex.io/ref/xingxingjun)
 
 ## 文档索引
 - [English README](README_en.md)