diff --git a/main.go b/main.go
index 3f3a057..e109bd1 100644
--- a/main.go
+++ b/main.go
@@ -29,6 +29,23 @@ func main() {
 	// may exit
 	list()
 
+	if argv.RedoGoMod {
+		repos := me.forge.Repos.SortByGoPath()
+		for repos.Scan() {
+			repo := repos.Next()
+			if !repo.IsValid() {
+				log.Printf("%10s %-50s", "old?", repo.GetGoPath())
+				continue
+			}
+			if me.forge.IsReadOnly(repo.GetGoPath()) {
+				log.Printf("%10s %-50s", "readonly", repo.GetGoPath())
+				continue
+			}
+			repo.RedoGoMod()
+		}
+		os.Exit(0)
+	}
+
 	me.myGui = gui.New()
 	me.myGui.Default()