Add some comments

src/LocalPeerFinder.java

@@ -202,6 +202,9 @@ public void run()
 
   }
 
+  /**
+   * Get the local discovery information for this node, if it exists
+   */
   public LocalPeerDisco getDiscoCache(AddressSpecHash node_id)
   {
     synchronized(disco_cache)

src/PeerLink.java

@@ -92,13 +92,16 @@ private ConnectInfo findConnectInfo()
   {
     NetworkExaminer net_ex = node.getNetworkExaminer();
     LocalPeerDisco disco = node.getLocalPeerFinder().getDiscoCache(remote_node_id);
+
+    // If we have local discovery information for this node, prefer that over whatever
+    // is in the PeerInfo.
     if (disco != null)
     {
       logger.fine("Using disco: " + disco);
       return ConnectInfo.newBuilder()
         .setHost(disco.getIpAddresses(0)) // The local peer finder trims the list to just the one we got this from
         .setPort(disco.getPort())
-        .setProtocol("mcast_disco")
+        .setProtocol("mcast_disco") // If something reads this proto, something has gone wrong.  But setting it just in case.
        .build();
     }