diff --git a/README.md b/README.md
index c48d87f..63bb794 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+![知识星球](./zsxq.png)
+
 # bt-qmt-store
 Backtrader QMT Store
 
@@ -18,3 +20,14 @@ store = QmtStore()
 data = store.getdata(dataname='600115.SH', timeframe=bt.TimeFrame.Days, fromdate=datetime(2022, 1, 1), todate=datetime(2023, 9, 6), dividend_type='front')
 cerebro.adddata(data)
 ```
+
+### timeframe
+支持以下时间周期：
+
+```python
+period_map = {
+  bt.TimeFrame.Days: '1d',
+  bt.TimeFrame.Minutes: '1m',
+  bt.TimeFrame.Ticks: 'tick'
+}
+```
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