diff --git a/intra/protect/icmplistener.go b/intra/protect/icmplistener.go
index 44f8947f..b82c178d 100644
--- a/intra/protect/icmplistener.go
+++ b/intra/protect/icmplistener.go
@@ -69,6 +69,7 @@ func (ln *icmplistener) listenICMP(network, address string) (net.PacketConn, err
 		syscall.Close(s)
 		return nil, os.NewSyscallError("bind", err)
 	}
+	// why? github.com/golang/go/issues/15021#issuecomment-308562480
 	f := os.NewFile(uintptr(s), "datagram-oriented icmp")
 	c, cerr = net.FilePacketConn(f)
 	f.Close()
diff --git a/intra/protect/xdial.go b/intra/protect/xdial.go
index 1178f253..a1ad38ec 100644
--- a/intra/protect/xdial.go
+++ b/intra/protect/xdial.go
@@ -29,6 +29,8 @@ type DialFn func(network, addr string) (net.Conn, error)
 
 type RDialer interface {
 	// Handle uniquely identifies the concrete type backing this dialer.
+	// Useful as a phantom reference to this dialer.
+	// github.com/hashicorp/terraform/blob/325d18262/internal/configs/configschema/decoder_spec.go#L32
 	Handle() uintptr
 	// Dial creates a connection to the given address,
 	// the resulting net.Conn must be a *net.TCPConn if