diff --git a/cmd/kubeadm/app/discovery/discovery.go b/cmd/kubeadm/app/discovery/discovery.go
index 3e64b38de00..b452285fa41 100644
--- a/cmd/kubeadm/app/discovery/discovery.go
+++ b/cmd/kubeadm/app/discovery/discovery.go
@@ -64,7 +64,7 @@ func GetValidatedClusterInfoObject(cfg *kubeadmapi.NodeConfiguration) (*clientcm
 	}
 }
 
-// isHTTPSURL checks whether the string is parsable as an URL
+// isHTTPSURL checks whether the string is parsable as an URL and whether the Scheme is https
 func isHTTPSURL(s string) bool {
 	u, err := url.Parse(s)
 	return err == nil && u.Scheme == "https"