diff --git a/README.md b/README.md
index b637a89..b774840 100644
--- a/README.md
+++ b/README.md
@@ -152,7 +152,7 @@ let trade_config = TradeConfig::builder(rpc_url, swqos_configs, commitment)
     // .check_min_tip(false)               // default: false - filter SWQOS below min tip
     // .swqos_cores_from_end(false)        // default: false - bind SWQOS to last N CPU cores
     // .mev_protection(false)              // default: false - MEV (Astralane QUIC :9000 or HTTP mev-protect / BlockRazor)
-    // .use_pumpfun_v2(false)             // default: false - V1 (18 accounts); set true for V2 (27 accounts, quote_mint) when PumpFun deploys V2
+    // .use_pumpfun_v2(true)              // PumpFun V2 (27 accounts, quote_mint); required for USDC-paired PumpFun coins
     .build();
 
 // Create TradingClient
@@ -376,7 +376,7 @@ PumpFun has two instruction sets for bonding-curve trading:
 
 **How to enable V2:**
 
-**Method 1 — Global runtime flag** (recommended when PumpFun officially deploys V2 on mainnet):
+**Method 1 — Global runtime flag** (recommended for `TradingClient`; required for USDC-paired coins):
 
 ```rust
 let trade_config = TradeConfig::builder(rpc_url, swqos_configs, commitment)
@@ -384,7 +384,9 @@ let trade_config = TradeConfig::builder(rpc_url, swqos_configs, commitment)
     .build();
 ```
 
-**Method 2 — Per-trade via `quote_mint`** (for USDC-paired coins or mixed V1/V2 scenarios):
+**Method 2 — Set the quote mint on `PumpFunParams`**:
+
+When using the high-level `TradingClient`, keep `.use_pumpfun_v2(true)` enabled in `TradeConfig` and set `quote_mint` on the PumpFun params to select the pair:
 
 ```rust
 use sol_trade_sdk::constants::WSOL_TOKEN_ACCOUNT;
@@ -399,6 +401,8 @@ let params = PumpFunParams::from_trade(/* ... */)
     .with_quote_mint(USDC_TOKEN_ACCOUNT);
 ```
 
+`with_quote_mint(...)` also marks the params as V2-capable for lower-level instruction builders, but the high-level `TradingClient` uses the client-level `use_pumpfun_v2` runtime flag when choosing V1 vs V2.
+
 > **Note**: V2 transactions with ATA creation + durable nonce may exceed `PACKET_DATA_SIZE`. Enable an Address Lookup Table (`address_lookup_table_account`) when using V2.
 
 #### PumpSwap: coin_creator_vault from events (no RPC)
diff --git a/README_CN.md b/README_CN.md
index a8797e1..b9333a7 100755
--- a/README_CN.md
+++ b/README_CN.md
@@ -152,6 +152,7 @@ let trade_config = TradeConfig::builder(rpc_url, swqos_configs, commitment)
     // .check_min_tip(false)               // 默认: false - 过滤低于最低小费的 SWQOS
     // .swqos_cores_from_end(false)        // 默认: false - 将 SWQOS 绑定到末尾 N 个 CPU 核心
     // .mev_protection(false)              // 默认: false - MEV（Astralane QUIC :9000 或 HTTP mev-protect / BlockRazor）
+    // .use_pumpfun_v2(true)               // PumpFun V2（27 个账户，quote_mint）；USDC 配对 PumpFun 币必须开启
     .build();
 
 // 创建 TradingClient
@@ -372,7 +373,15 @@ Pump.fun 已升级 Bonding Curve 合约，推出**统一化 v2 指令**，通过
 
 **使用方式：**
 
-设置 `PumpFunParams` 的 `quote_mint` 即可，SDK 会自动切换到 v2 discriminator 和新账户布局：
+高层 `TradingClient` 需要先在 `TradeConfig` 开启 PumpFun V2；USDC 配对币必须开启：
+
+```rust
+let trade_config = TradeConfig::builder(rpc_url, swqos_configs, commitment)
+    .use_pumpfun_v2(true)
+    .build();
+```
+
+然后在 `PumpFunParams` 设置 `quote_mint` 来选择 SOL/USDC 配对：
 
 ```rust
 use sol_trade_sdk::constants::WSOL_TOKEN_ACCOUNT;
@@ -391,6 +400,8 @@ client.buy(buy_params).await?;
 client.sell(sell_params).await?;
 ```
 
+`with_quote_mint(...)` 会把参数标记为可使用 V2，底层 instruction builder 可据此走 V2；但高层 `TradingClient` 选择 V1/V2 时使用的是 client 级别的 `use_pumpfun_v2` 运行时开关。
+
 | quote_mint | use_v2_ix | 实际使用的指令 | 说明 |
 |-----------|-------------|---------|------|
 | 未设置（默认） | `false` | 旧版 `buy`/`sell`/`buy_exact_sol_in` | 向后兼容，仅 SOL |