diff --git a/README.md b/README.md
index 4d43c5b..66dc430 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,21 @@
 - 配置默认网格策略模板。
 - 手动录入、编辑、删除买入/卖出成交。
 - 自动计算持仓数量、T+1 可用数量、持仓成本、已实现盈亏、累计网格利润、持仓回本价、账户回本价。
+- 点击“刷新行情”从腾讯接口获取实时价格，并用实时价更新持仓市值和账户摘要。
 - 使用 SQLite 本地保存数据，默认路径为 `data/grid_trading.db`。
 
+## 行情说明
+
+行情刷新使用腾讯接口：
+
+```text
+http://qt.gtimg.cn/q=<symbol>
+```
+
+例如 `000001` 会自动转换为 `sz000001`，`600000` 会自动转换为 `sh600000`。
+
+实时行情只保存在当前程序内存中，用于显示现价、持仓市值、浮动盈亏、总资产和资金使用率；不会覆盖标的里的手动价格，也不会写入 SQLite。关闭软件后再次打开，需要重新点击“刷新行情”。
+
 ## 开发环境
 
 ```powershell
diff --git a/src/grid_trading/market/tencent.py b/src/grid_trading/market/tencent.py
index 57ca380..c7b9b1e 100644
--- a/src/grid_trading/market/tencent.py
+++ b/src/grid_trading/market/tencent.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 import re
 from decimal import Decimal, InvalidOperation
 from typing import Callable, Iterable
+from urllib.error import HTTPError, URLError
 from urllib.request import urlopen
 
 from grid_trading.domain.models import Instrument, QuoteSnapshot
@@ -61,7 +62,10 @@ class TencentQuoteProvider:
             return {}
         query = ",".join(symbols)
         url = f"{self.endpoint}{query}"
-        raw = self._fetcher(url, self.timeout)
+        try:
+            raw = self._fetcher(url, self.timeout)
+        except (OSError, HTTPError, URLError) as exc:
+            raise QuoteFetchError(f"Tencent quote request failed: {exc}") from exc
         return {quote.code: quote for quote in parse_tencent_response(raw)}
 
 
diff --git a/tests/test_tencent_quotes.py b/tests/test_tencent_quotes.py
index 35412ce..f134d96 100644
--- a/tests/test_tencent_quotes.py
+++ b/tests/test_tencent_quotes.py
@@ -64,3 +64,13 @@ def test_provider_builds_batch_query_and_maps_by_code():
 
     assert "q=sz000001" in calls[0]
     assert quotes["000001"].price == Decimal("10.60")
+
+
+def test_provider_wraps_fetch_errors():
+    def failing_fetch(url: str, timeout: float) -> bytes:
+        raise OSError("bad gateway")
+
+    provider = TencentQuoteProvider(fetcher=failing_fetch)
+
+    with pytest.raises(QuoteFetchError, match="Tencent quote request failed"):
+        provider.fetch_quotes([Instrument(id=1, code="000001", name="平安银行")])