diff --git a/src/main/java/nowcoder/NowCoder_ExpressToDesired.java b/src/main/java/nowcoder/NowCoder_ExpressToDesired.java
index 708192c3c0a0cbcdab4c804a667c695c9117270e..885ff1a33238f7fcb2c72d96575e0b97357dd8e2 100644
--- a/src/main/java/nowcoder/NowCoder_ExpressToDesired.java
+++ b/src/main/java/nowcoder/NowCoder_ExpressToDesired.java
@@ -1,5 +1,5 @@
 package nowcoder;
-
+// 笔记：https://www.cnblogs.com/greyzeng/p/16823219.html
 // https://www.nowcoder.com/questionTerminal/ec646f8954e64453bf1a9899a27cfbd6
 //tips:
 //        范围上尝试的模型