diff --git a/README.md b/README.md
index 19ef230..6811d1f 100644
--- a/README.md
+++ b/README.md
@@ -12,5 +12,4 @@ This is a data collecting project, with both `python` and `R`
 
 * Thanks [akshare](https://github.com/jindaxiang/akshare/)
 * Thanks [EastMoney](https://www.eastmoney.com)
-
-https://fred.stlouisfed.org/graph/fredgraph.csv?id=GDP&cosd=1947-01-01&coed=2021-01-01
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+* Thanks [St.Louis Fred Reserve Bank](https://fred.stlouisfed.org/)
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