diff --git a/README.md b/README.md
index e5f8205..0e1f961 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,21 @@ ex : {3$$a1|{b2|c3|}|d4|{-$$|f|g}|{-2$$h||i}|{1-$$j|k|}}/{$$l|m|}/{0$$n|}
 {-$$a|b|c} -> {0-3$$a|b|c}  0-max
 ```
 
+### ex2
+
+- ~/a/b.txt
+```
+1
+```
+- ~/b.txt
+```
+2
+```
+
+- __b__ to 1 or 2
+- __/b__ to 2
+- __/a/b__ to 1
+
 ### run sample
 
 ```