diff --git a/README.md b/README.md
index 3f513cf..da23e64 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,33 @@
-# HEIC2JPG
\ No newline at end of file
+# HEIC2JPG
+
+## Usage
+
+To convert a single file:
+
+`heic2jpg myfile.heic`
+
+To convert all files in a folder:
+
+`heic2jpg -dir ./MyPhotos -r`
+
+You can create new files in another folder with the `-o` argument
+
+Other arguments are available on `-h`
+
+## Build
+
+The tool contains C code, so you need to activate cgo to compile it.
+
+`go build`
+
+I compile with the following command (not sure if it speeds up conversion, but it makes the binary lighter):
+
+On Linux:
+```bash
+GOAMD64='v3' go build -a -v -ldflags="-s -w" -buildvcs=false
+```
+
+On Windows (PowerShell):
+```ps
+$env:GOAMD64 = 'v3'; go build -a -v -ldflags="-s -w" -buildvcs=false
+```
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 2d702e0..348a1cc 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/mojitaurelie/heic2jpg
 
-go 1.20
+go 1.21
 
 require github.com/adrium/goheif v0.0.0-20230113233934-ca402e77a786
 
diff --git a/main.go b/main.go
index 9b6f235..e6f0213 100644
--- a/main.go
+++ b/main.go
@@ -17,6 +17,18 @@ import (
 	"github.com/mojitaurelie/heic2jpg/exif"
 )
 
+const (
+	VERSION = "0.1.0"
+
+	usageDescription = `heic2jpg - v%s.%s.%s.%s
+Note: <file> is ignored when -dir is set
+
+	Usage: heic2jpg [OPTIONS] <file>
+
+OPTIONS:
+`
+)
+
 type (
 	filer interface {
 		IsDir() bool
@@ -25,11 +37,15 @@ type (
 )
 
 func usage() {
-	fmt.Printf("Usage: %s [OPTIONS] <file>\n\n", os.Args[0])
-	fmt.Printf("Note: <file> is ignored when -dir is set\n\nOPTIONS:\n")
+	fmt.Printf(usageDescription, VERSION, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 	flag.PrintDefaults()
 }
 
+func version() {
+	fmt.Printf("heic2jpg - v%s.%s.%s.%s\n", VERSION, runtime.Version(), runtime.GOOS, runtime.GOARCH)
+	os.Exit(0)
+}
+
 func main() {
 	go func() {
 		if r := recover(); r != nil {
@@ -48,8 +64,13 @@ func main() {
 	removeOrig := flag.Bool("remove-original", false, "Remove the heic file after conversion")
 	overwriteOut := flag.Bool("overwrite", false, "Overwrite file if already exists")
 	outPath := flag.String("o", "", "Output directory")
+	v := flag.Bool("v", false, "Show version")
 	flag.Parse()
 
+	if *v {
+		version()
+	}
+
 	if *jpegQuality < 1 || *jpegQuality > 100 {
 		fmt.Println("W: Illegal value for jpeg quality, quality is set to ", jpeg.DefaultQuality)
 		*jpegQuality = jpeg.DefaultQuality