diff --git a/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/NetworkModule.java b/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/NetworkModule.java
index f1c676c9..5431f148 100644
--- a/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/NetworkModule.java
+++ b/org.eclipse.paho.client.mqttv3/src/main/java/org/eclipse/paho/client/mqttv3/internal/NetworkModule.java
@@ -25,7 +25,7 @@
  * A NetworkModule provides access to a specific transport to the broker. This may be a plain socket, a TLS secured
  * connection, a serial line, etc.
  *
- * <h3>Lifecycle</h3>
+ * <h2>Lifecycle</h2>
  * Each NetworkModule instance has a lifecycle with the following logical states:
  * <ul>
  * <li><b>CREATED</b> - the instance holds no connection to its broker, no network resources are allocated and the