diff --git a/ticket.go b/ticket.go
index cf50f85..5a51eeb 100644
--- a/ticket.go
+++ b/ticket.go
@@ -69,7 +69,7 @@ type SessionState struct {
 	// To allow different layers in a protocol stack to share this field,
 	// applications must only append to it, not replace it, and must use entries
 	// that can be recognized even if out of order (for example, by starting
-	// with a id and version prefix).
+	// with an id and version prefix).
 	Extra [][]byte
 
 	// EarlyData indicates whether the ticket can be used for 0-RTT in a QUIC