diff --git a/README.md b/README.md
index 1dbf91b..bb248c4 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,10 @@
-# FreemodbusCrcShell
-Free Modbus CRC Shell
+# Example
+```
+Input modbus package Hex string, output crc result.
+> 01 11
+Lo: C0  Hi: 2C
+> 01 11 C0 2C
+Lo: 0  Hi: 0
+> exit
+
+```