diff --git a/peer/packets.go b/peer/packets.go
index b300dee..5be89b0 100644
--- a/peer/packets.go
+++ b/peer/packets.go
@@ -9,10 +9,18 @@ const (
 	packetTypeAck           = 3
 	packetTypeProbe         = 4
 	packetTypeAddrDiscovery = 5
+	packetTypeInit          = 6
 )
 
 // ----------------------------------------------------------------------------
 
+type packetInit struct {
+	TraceID uint64
+	Version uint64
+}
+
+// ----------------------------------------------------------------------------
+
 type packetSyn struct {
 	TraceID       uint64   // TraceID to match response w/ request.
 	SharedKey     [32]byte // Our shared key.