diff --git a/p2p/plugin/grpc_test.go b/p2p/plugin/grpc_test.go
index e62235a..6307d2e 100644
--- a/p2p/plugin/grpc_test.go
+++ b/p2p/plugin/grpc_test.go
@@ -396,12 +396,12 @@ func TestHandshakeForward(t *testing.T) {
 }
 
 func TestSupportedDialer(t *testing.T) {
-	for _, name := range []string{"tcp", "tls", "ws", "mtcp", "mtls", "mws", "udp"} {
+	for _, name := range []string{"tcp", "tls", "ws", "wss", "grpc", "http2", "h2", "ssh", "sshd", "mtcp", "mtls", "mws", "mwss", "udp"} {
 		if !xp2p.SupportedDialer(name) {
 			t.Errorf("SupportedDialer(%q) = false, want true", name)
 		}
 	}
-	for _, name := range []string{"kcp", "quic", "grpc", "http2", ""} {
+	for _, name := range []string{"kcp", "quic", "bogus", ""} {
 		if xp2p.SupportedDialer(name) {
 			t.Errorf("SupportedDialer(%q) = true, want false (fail closed)", name)
 		}
diff --git a/p2p/tunnel_dialer.go b/p2p/tunnel_dialer.go
index fcd34c9..79a65d5 100644
--- a/p2p/tunnel_dialer.go
+++ b/p2p/tunnel_dialer.go
@@ -55,8 +55,8 @@ func NewTunnelDialer(inner dialer.Dialer, t Tunnel, opts ...TunnelOption) dialer
 // protocol on top of a p2p tunnel. The wrapper's implicit contract is
 // "inner dials one plain conn via options.Dialer and uses it as its base" —
 // a byte stream for the stream dialers (mux inners dial it once per session
-// and multiplex streams over it), a datagram stream for udp. kcp/quic
-// bases, http2 probes and destroys tunnels. Fail closed: new dialers are
+// and multiplex streams over it), a datagram stream for udp. kcp/quic bases
+// break that contract and destroy tunnels. Fail closed: new dialers are
 // unsupported until verified.
 func SupportedDialer(name string) bool {
 	switch name {