diff --git a/p2p/secret_connection.go b/p2p/secret_connection.go
index 723ee0a94..54e3e0c5e 100644
--- a/p2p/secret_connection.go
+++ b/p2p/secret_connection.go
@@ -42,6 +42,7 @@ type SecretConnection struct {
 // Performs handshake and returns a new authenticated SecretConnection.
 // Returns nil if error in handshake.
 // Caller should call conn.Close()
+// See docs/sts-final.pdf for more information.
 func MakeSecretConnection(conn io.ReadWriteCloser, locPrivKey acm.PrivKeyEd25519) (*SecretConnection, error) {
 
 	locPubKey := locPrivKey.PubKey().(acm.PubKeyEd25519)