diff --git a/license.go b/license.go
index 6d88995..1b992c6 100644
--- a/license.go
+++ b/license.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"embed"
+	"errors"
 	"fmt"
 	"path/filepath"
 	"strings"
@@ -13,6 +14,8 @@ const (
 	templatesPath = "templates"
 )
 
+var ErrInvalidLicense = errors.New("invalid license")
+
 //go:embed templates/*
 var embedFS embed.FS
 
@@ -35,13 +38,13 @@ type templateInfo struct {
 
 func generateLicense(name string) (string, error) {
 	if name == "" {
-		return "", fmt.Errorf("empty license name")
+		return "", fmt.Errorf("empty license name: %w", ErrInvalidLicense)
 	}
 	name = strings.ToUpper(name)
 
 	templateInfo, ok := templates[name]
 	if !ok {
-		return "", fmt.Errorf("not support license %s", name)
+		return "", fmt.Errorf("not support license %s: %w", name, ErrInvalidLicense)
 	}
 
 	// Get correct path of license