diff --git a/Spike/Program.cs b/Spike/Program.cs
index 7347750..e6659d9 100644
--- a/Spike/Program.cs
+++ b/Spike/Program.cs
@@ -55,7 +55,7 @@ static void Main(string[] args)
             var sd = new ServiceDiscovery(mdns);
             sd.Advertise(new ServiceProfile("x1", "_xservice._tcp", 5011));
             sd.Advertise(new ServiceProfile("x2", "_xservice._tcp", 666));
-            var z1 = new ServiceProfile("z1", "_zservice._tcp", 5012);
+            var z1 = new ServiceProfile("z1", "_zservice.udp", 5012);
             z1.AddProperty("foo", "bar");
             sd.Advertise(z1);
 
diff --git a/src/Mdns.csproj b/src/Mdns.csproj
index 0f232db..f7e9b7f 100644
--- a/src/Mdns.csproj
+++ b/src/Mdns.csproj
@@ -31,7 +31,7 @@
 
   <ItemGroup>
     <PackageReference Include="Common.Logging" Version="3.4.1" />
-    <PackageReference Include="Makaretu.Dns" Version="0.13.3" />
+    <PackageReference Include="Makaretu.Dns" Version="0.13.4" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard14'">
diff --git a/src/ServiceDiscovery.cs b/src/ServiceDiscovery.cs
index 079c4ac..8f5574a 100644
--- a/src/ServiceDiscovery.cs
+++ b/src/ServiceDiscovery.cs
@@ -1,4 +1,5 @@
-using Makaretu.Dns.Resolving;
+using Common.Logging;
+using Makaretu.Dns.Resolving;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -13,6 +14,8 @@ namespace Makaretu.Dns
     /// <seealso href="https://tools.ietf.org/html/rfc6763">RFC 6763 DNS-Based Service Discovery</seealso>
     public class ServiceDiscovery : IDisposable
     {
+        static readonly ILog log = LogManager.GetLogger(typeof(ServiceDiscovery));
+
         /// <summary>
         ///   The service discovery service name.
         /// </summary>
@@ -136,6 +139,9 @@ void OnAnswer(object sender, MessageEventArgs e)
         void OnQuery(object sender, MessageEventArgs e)
         {
             var request = e.Message;
+
+            if (log.IsDebugEnabled)
+                log.Debug($"got query for {request.Questions[0].Name} {request.Questions[0].Type}");
             var response = NameServer.ResolveAsync(request).Result;
             if (response.Status == MessageStatus.NoError)
             {
@@ -147,6 +153,8 @@ void OnQuery(object sender, MessageEventArgs e)
                 }
 
                 Mdns.SendAnswer(response);
+                if (log.IsDebugEnabled)
+                    log.Debug($"sent answer {response.Answers[0]}");
                 //Console.WriteLine($"Response time {(DateTime.Now - request.CreationTime).TotalMilliseconds}ms");
             }
         }