diff --git a/main.go b/main.go
index 67eac82..bd7a330 100644
--- a/main.go
+++ b/main.go
@@ -21,11 +21,13 @@ import (
 )
 
 var (
-	httpFlag  = flag.String("http", ":8080", "Serve HTTP at given address")
-	httpsFlag = flag.String("https", "", "Serve HTTPS at given address")
-	certFlag  = flag.String("cert", "", "Use the provided TLS certificate")
-	keyFlag   = flag.String("key", "", "Use the provided TLS key")
-	acmeFlag  = flag.String("acme", "", "Auto-request TLS certs and store in given directory")
+	httpFlag   = flag.String("http", ":8080", "Serve HTTP at given address")
+	httpsFlag  = flag.String("https", "", "Serve HTTPS at given address")
+	certFlag   = flag.String("cert", "", "Use the provided TLS certificate")
+	keyFlag    = flag.String("key", "", "Use the provided TLS key")
+	acmeFlag   = flag.String("acme", "", "Auto-request TLS certs and store in given directory")
+	domainFlag = flag.String("domain", "gopkg.in", "Domain name")
+	userFlag   = flag.String("username", "", "Github username")
 )
 
 var httpServer = &http.Server{
@@ -185,11 +187,13 @@ var redirect = map[repoBase]repoBase{
 
 // GitHubRoot returns the repository root at GitHub, without a schema.
 func (repo *Repo) GitHubRoot() string {
+	if *userFlag != "" {
+		return "github.com/" + *userFlag + "/" + repo.Name
+	}
 	if repo.User == "" {
 		return "github.com/go-" + repo.Name + "/" + repo.Name
-	} else {
-		return "github.com/" + repo.User + "/" + repo.Name
 	}
+	return "github.com/" + repo.User + "/" + repo.Name
 }
 
 // GitHubTree returns the repository tree name at GitHub for the selected version.
@@ -218,20 +222,19 @@ func (repo *Repo) GopkgVersionRoot(version Version) string {
 	v := version.String()
 	if repo.OldFormat {
 		if repo.User == "" {
-			return "gopkg.in/" + v + "/" + repo.Name
+			return *domainFlag + "/" + v + "/" + repo.Name
 		} else {
-			return "gopkg.in/" + repo.User + "/" + v + "/" + repo.Name
+			return *domainFlag + "/" + repo.User + "/" + v + "/" + repo.Name
 		}
 	} else {
 		if repo.User == "" {
-			return "gopkg.in/" + repo.Name + "." + v
+			return *domainFlag + "/" + repo.Name + "." + v
 		} else {
-			return "gopkg.in/" + repo.User + "/" + repo.Name + "." + v
+			return *domainFlag + "/" + repo.User + "/" + repo.Name + "." + v
 		}
 	}
 }
 
-
 var patternOld = regexp.MustCompile(`^/(?:([a-z0-9][-a-z0-9]+)/)?((?:v0|v[1-9][0-9]*)(?:\.0|\.[1-9][0-9]*){0,2}(?:-unstable)?)/([a-zA-Z][-a-zA-Z0-9]*)(?:\.git)?((?:/[a-zA-Z][-a-zA-Z0-9]*)*)$`)
 var patternNew = regexp.MustCompile(`^/(?:([a-zA-Z0-9][-a-zA-Z0-9]+)/)?([a-zA-Z][-.a-zA-Z0-9]*)\.((?:v0|v[1-9][0-9]*)(?:\.0|\.[1-9][0-9]*){0,2}(?:-unstable)?)(?:\.git)?((?:/[a-zA-Z0-9][-.a-zA-Z0-9]*)*)$`)