diff --git a/x509.go b/x509.go
index 5089ab5..6621e65 100644
--- a/x509.go
+++ b/x509.go
@@ -83,6 +83,10 @@ func ParseRDNSequence(rdnsBytes []byte) (RDNSequence, error) {
 	return rdns, nil
 }
 
+func MarshalRDNSequence(rdns RDNSequence) ([]byte, error) {
+	return asn1.Marshal(rdns)
+}
+
 type TBSCertificate struct {
 	Raw asn1.RawContent