diff --git a/solution/0100-0199/0121.Best Time to Buy and Sell Stock/README.md b/solution/0100-0199/0121.Best Time to Buy and Sell Stock/README.md
index 507a0842b58ed..cc0fa97f69f0e 100644
--- a/solution/0100-0199/0121.Best Time to Buy and Sell Stock/README.md	
+++ b/solution/0100-0199/0121.Best Time to Buy and Sell Stock/README.md	
@@ -44,6 +44,8 @@
 
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+参考本站 [面试题 63. 股票的最大利润](/lcof/%E9%9D%A2%E8%AF%95%E9%A2%9863.%20%E8%82%A1%E7%A5%A8%E7%9A%84%E6%9C%80%E5%A4%A7%E5%88%A9%E6%B6%A6/README.md?id=%E8%A7%A3%E6%B3%95)（题意相同）。
+
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 ### **Python3**