diff --git a/.gitignore b/.gitignore
index 38a7bcb..a799775 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 a.nex
-test.go
\ No newline at end of file
+test.go
+SeqCombGo
\ No newline at end of file
diff --git a/README.md b/README.md
index 4c103a7..3c3c6e7 100644
--- a/README.md
+++ b/README.md
@@ -37,3 +37,7 @@ SeqCombGo -o export.nex import1.fas import2.fas
   url    = {https://github.com/MalacoLab/SeqCombGo},
 }
 ```
+
+# Detail
+
+tobedo
\ No newline at end of file
diff --git a/count.go b/count.go
index 978f40d..fd84e32 100644
--- a/count.go
+++ b/count.go
@@ -47,5 +47,6 @@ func fas_name(old_name string) string {
 	matchArr := compileRegex.FindStringSubmatch(old_name)
 	//needed to use the string get from the old string
 	new_name := matchArr[len(matchArr)-1]
+	// 这里有 bug
 	return new_name
 }
diff --git a/flag.go b/flag.go
index adc5b9d..a9eaa53 100644
--- a/flag.go
+++ b/flag.go
@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"os"
 )
 
 var (
@@ -10,11 +11,44 @@ var (
 	file_input  []string
 )
 
+// http://www.network-science.de/ascii/
+// is there any better way to print logo? plz contact us
+func print_logo() {
+	fmt.Print("__              ___                _       ___      \n" +
+		"/ _\\ ___  __ _  / __\\___  _ __ ___ | |__   / _ \\___  \n" +
+		"\\ \\ / _ \\/ _` |/ /  / _ \\| '_ ` _ \\| '_ \\ / /_\\/ _ \\ \n" +
+		"_\\ \\  __/ (_| / /__| (_) | | | | | | |_) / /_\\ (_) |\n" +
+		"\\__/\\___|\\__, \\____/\\___/|_| |_| |_|_.__/\\____/\\___/ \n" +
+		"            |_|                                      \n")
+	fmt.Println("  Sequence Combination tool written in Golang")
+	fmt.Println("Version 0.0.1  Authors:An,G;Zhang,G  License:GPL-3.0")
+}
+
+// __              ___                _       ___
+// / _\ ___  __ _  / __\___  _ __ ___ | |__   / _ \___
+// \ \ / _ \/ _` |/ /  / _ \| '_ ` _ \| '_ \ / /_\/ _ \
+// _\ \  __/ (_| / /__| (_) | | | | | | |_) / /_\\ (_) |
+// \__/\___|\__, \____/\___/|_| |_| |_|_.__/\____/\___/
+//             |_|
+
 func dna_flag() {
 	flag.StringVar(&file_output, "o", "a.nex", "output file")
+	flag.Usage = usage
 	flag.Parse()
 	file_input = flag.Args() // []string{"foo", "bar"}
-	fmt.Println("==============")
+	// 这里应该加个判断，如果输入不符合，后面的正则会报错
+	print_logo()
+	fmt.Println()
 	fmt.Println("[input  file:]", file_input)
 	fmt.Println("[output file:]", file_output)
 }
+
+func usage() {
+	print_logo()
+	fmt.Fprintf(os.Stderr, `
+Example:
+	SeqCombGo -o export.nex import1.fas import2.fas ...
+Options:
+`)
+	flag.PrintDefaults()
+}
diff --git a/nex.tmpl b/nex.tmpl
deleted file mode 100644
index 807700c..0000000
--- a/nex.tmpl
+++ /dev/null
@@ -1,15 +0,0 @@
-#NEXUS
-BEGIN DATA;
-	DIMENSIONS NTAX={{ .Ntax }} NCHAR={{ .Nchar }};
-	FORMAT DATATYPE=DNA GAP=- MISSING=?;
-MATRIX
-{{- range $k, $v := .Matrix }}
-'{{ $k }}' {{ $v }}
-{{- end }}
-;
-END;
-BEGIN SETS;
-{{- range $_, $i := .Charset }}
-	CHARSET {{ $i.Name }} = {{ $i.From }}-{{ $i.To }};
-{{- end }}
-END;
\ No newline at end of file
diff --git a/gocomb.go b/seqcomb.go
similarity index 100%
rename from gocomb.go
rename to seqcomb.go
diff --git a/tmpl.go b/template.go
similarity index 61%
rename from tmpl.go
rename to template.go
index 9f1185e..c1ca517 100644
--- a/tmpl.go
+++ b/template.go
@@ -2,22 +2,30 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"text/template"
 )
 
+const f string = `#NEXUS
+BEGIN DATA;
+	DIMENSIONS NTAX={{ .Ntax }} NCHAR={{ .Nchar }};
+	FORMAT DATATYPE=DNA GAP=- MISSING=?;
+MATRIX
+{{- range $k, $v := .Matrix }}
+'{{ $k }}' {{ $v }}
+{{- end }}
+;
+END;
+BEGIN SETS;
+{{- range $_, $i := .Charset }}
+	CHARSET {{ $i.Name }} = {{ $i.From }}-{{ $i.To }};
+{{- end }}
+END;`
+
 func do_impl(last_data tmpl_data) {
-
-	f, err := ioutil.ReadFile("nex.tmpl")
-	if err != nil {
-		fmt.Println(err)
-		return
-	}
-
 	// 读取模板
-	// read the template 
-	nex_tmpl, err := template.New("nex").Parse(string(f))
+	// read the template
+	nex_tmpl, err := template.New("nex").Parse(f)
 	if err != nil {
 		fmt.Println("[ tmpl err ]", err)
 		return