diff --git a/src/zutil/net/mqtt/MqttBroker.java b/src/zutil/net/mqtt/MqttBroker.java
index 6c46b53..3561f02 100755
--- a/src/zutil/net/mqtt/MqttBroker.java
+++ b/src/zutil/net/mqtt/MqttBroker.java
@@ -1,7 +1,7 @@
 /*
  * The MIT License (MIT)
  *
- * Copyright (c) 2020 Ziver Koc
+ * Copyright (c) 2020-2025 Ziver Koc
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -49,7 +49,7 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 /**
- * TODO:
+ * This class implements a MQTT Broker. Where arbitrary data can be published by clients and received by subscribers.
  *
  * @see <a href="http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/mqtt-v3.1.1.html">MQTT v3.1.1 Spec</a>
  */
@@ -504,7 +504,7 @@ public class MqttBroker extends ThreadedTCPNetworkServer {
 
         private void handlePublish(MqttPacketPublish publishPacket) {
             if (publishPacket.getFlagQoS() != 0)
-                throw new UnsupportedOperationException("QoS larger then 0 not supported.");
+                throw new UnsupportedOperationException("QoS larger then 0 not supported (value: " + publishPacket.getFlagQoS() + ").");
             if (publishPacket.getFlagQoS() >= 3)
                 throw new IllegalArgumentException("QoS value of 3 is not valid.");