diff --git a/main.go b/main.go
index edb86d7..89b739d 100644
--- a/main.go
+++ b/main.go
@@ -211,6 +211,7 @@ func main() {
 		archiveRoot  = flag.String("archive", "/data/mirror/archive.ubuntu.com/ubuntu", "archive ubuntu root")
 		securityRoot = flag.String("security", "/data/mirror/security.ubuntu.com/ubuntu", "security ubuntu root")
 		oldReleases  = flag.String("old", "/data/mirror/old-releases.ubuntu.com/ubuntu", "old-releases ubuntu root")
+		msRoot       = flag.String("ms", "/data/mirror/packages.microsoft.com/repos", "microsoft repos root")
 		autoIndex    = flag.Bool("autoindex", true, "enable directory listings")
 		cacheSeconds = flag.Int("cache", 600, "Cache-Control max-age seconds (0 to disable)")
 		trustProxy   = flag.Bool("trust-proxy", true, "trust X-Forwarded-For / X-Real-IP")