diff --git a/cmd/fdroidcl/main.go b/cmd/fdroidcl/main.go
index 172674b..cd67ebb 100644
--- a/cmd/fdroidcl/main.go
+++ b/cmd/fdroidcl/main.go
@@ -17,9 +17,6 @@ import (
 
 const (
 	cmdName = "fdroidcl"
-
-	repoName = "repo"
-	repoURL  = "https://f-droid.org/repo"
 )
 
 func subdir(dir, name string) string {
@@ -47,16 +44,18 @@ func mustConfig() string {
 }
 
 type Repo struct {
+	ID  string `json:"id"`
 	URL string `json:"url"`
 }
 
 type userConfig struct {
-	Repos map[string]Repo `json:"repos"`
+	Repos []Repo `json:"repos"`
 }
 
 var config = userConfig{
-	Repos: map[string]Repo{
-		"f-droid": {
+	Repos: []Repo{
+		{
+			ID:  "f-droid",
 			URL: "https://f-droid.org/repo",
 		},
 	},
@@ -89,6 +88,13 @@ func readConfig() {
 	}
 }
 
+func mustOneRepo() *Repo {
+	if len(config.Repos) != 1 {
+		log.Fatalf("Exactly one repo is needed")
+	}
+	return &config.Repos[0]
+}
+
 // A Command is an implementation of a go command
 // like go build or go fix.
 type Command struct {
diff --git a/cmd/fdroidcl/update.go b/cmd/fdroidcl/update.go
index 3a56511..c2d7f87 100644
--- a/cmd/fdroidcl/update.go
+++ b/cmd/fdroidcl/update.go
@@ -34,8 +34,9 @@ func runUpdate(args []string) {
 }
 
 func updateIndex() error {
-	url := fmt.Sprintf("%s/%s", repoURL, "index.jar")
-	if err := downloadEtag(url, indexPath(repoName), nil); err != nil {
+	repo := mustOneRepo()
+	url := fmt.Sprintf("%s/%s", repo.URL, "index.jar")
+	if err := downloadEtag(url, indexPath(repo.ID), nil); err != nil {
 		return err
 	}
 	return nil
@@ -101,11 +102,12 @@ func downloadEtag(url, path string, sum []byte) error {
 }
 
 func indexPath(name string) string {
-	return filepath.Join(mustConfig(), repoName+".jar")
+	return filepath.Join(mustConfig(), name+".jar")
 }
 
 func mustLoadIndex() *fdroidcl.Index {
-	p := indexPath(repoName)
+	repo := mustOneRepo()
+	p := indexPath(repo.ID)
 	f, err := os.Open(p)
 	if err != nil {
 		log.Fatalf("Could not open index file: %v", err)