diff --git a/README.md b/README.md
index 0024a1b..27ed55b 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,47 @@
 # command
 
-utils for command line app
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+utils for command line app
+
+Provide two style for command line args parse:
+
+- use struct field tag
+- use command
+
+## Usage
+
+use struct field tag
+
+```go
+type targs struct {
+	Test     string `flag_default:"test" flag_usage:"this is test"`
+	TestBool bool   `flag_short:"b"`
+	TestInt  int
+}
+	sargs := &targs{}
+	v, _ := NewFVSet(sargs)
+	v.Usage()
+	err := Parse([]string{"--test", "test", "--test-bool", "--test-int", "1"}, v)
+```
+
+use command style
+
+```go
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"git.pyer.club/kingecg/command"
+)
+
+func main() {
+	var cmd = command.NewCommand("test", "test command")
+	cmd.AddArg("arg1", "a", "arg1 description", "default value")
+	cmd.AddArg("arg2", "b", "arg2 description", "default value")
+	cmd.AddSubCommand("sub1", "sub1 description")
+	cmd.Parse(os.Args[1:])
+	fmt.Println(cmd.GetGlobalOptions())
+}
+
+```
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diff --git a/test/main.go b/example/test/main.go
similarity index 100%
rename from test/main.go
rename to example/test/main.go
diff --git a/testcmd/main.go b/example/testcmd/main.go
similarity index 100%
rename from testcmd/main.go
rename to example/testcmd/main.go