diff --git a/interface.go b/interface.go
index a9b8cdeb..a2fdf1ae 100644
--- a/interface.go
+++ b/interface.go
@@ -6,10 +6,9 @@ import (
 	"net"
 	"time"
 
-	"github.com/lucas-clemente/quic-go/logging"
-
 	"github.com/lucas-clemente/quic-go/internal/handshake"
 	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/logging"
 	"github.com/lucas-clemente/quic-go/quictrace"
 )
 
@@ -29,6 +28,13 @@ type StreamID = protocol.StreamID
 // A VersionNumber is a QUIC version number.
 type VersionNumber = protocol.VersionNumber
 
+const (
+	// VersionDraft29 is IETF QUIC draft-29
+	VersionDraft29 = protocol.VersionDraft29
+	// VersionDraft32 is IETF QUIC draft-32
+	VersionDraft32 = protocol.VersionDraft32
+)
+
 // A Token can be used to verify the ownership of the client address.
 type Token struct {
 	// IsRetryToken encodes how the client received the token. There are two ways: