diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractBrokerRegistration.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractBrokerRegistration.java
index f4f8ebe90007..37c2d3b40022 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractBrokerRegistration.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractBrokerRegistration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,10 +42,16 @@ public abstract class AbstractBrokerRegistration {
 	private final List<String> destinationPrefixes;
 
 
+	/**
+	 * Create a new broker registration.
+	 * @param clientInboundChannel the inbound channel
+	 * @param clientOutboundChannel the outbound channel
+	 * @param destinationPrefixes the destination prefixes
+	 */
 	public AbstractBrokerRegistration(SubscribableChannel clientInboundChannel,
 			MessageChannel clientOutboundChannel, @Nullable String[] destinationPrefixes) {
 
-		Assert.notNull(clientOutboundChannel, "'clientInboundChannel' must not be null");
+		Assert.notNull(clientInboundChannel, "'clientInboundChannel' must not be null");
 		Assert.notNull(clientOutboundChannel, "'clientOutboundChannel' must not be null");
 
 		this.clientInboundChannel = clientInboundChannel;
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/SimpleBrokerRegistration.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/SimpleBrokerRegistration.java
index 4c11e6845523..68e60f691b5a 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/SimpleBrokerRegistration.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/SimpleBrokerRegistration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,8 +40,16 @@ public class SimpleBrokerRegistration extends AbstractBrokerRegistration {
 	private String selectorHeaderName = "selector";
 
 
-	public SimpleBrokerRegistration(SubscribableChannel inChannel, MessageChannel outChannel, String[] prefixes) {
-		super(inChannel, outChannel, prefixes);
+	/**
+	 * Create a new {@code SimpleBrokerRegistration}.
+	 * @param clientInboundChannel the inbound channel
+	 * @param clientOutboundChannel the outbound channel
+	 * @param destinationPrefixes the destination prefixes
+	 */
+	public SimpleBrokerRegistration(SubscribableChannel clientInboundChannel,
+			MessageChannel clientOutboundChannel, String[] destinationPrefixes) {
+
+		super(clientInboundChannel, clientOutboundChannel, destinationPrefixes);
 	}
 
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/StompBrokerRelayRegistration.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/StompBrokerRelayRegistration.java
index d24b63e2dd01..526c4cf4fd73 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/config/StompBrokerRelayRegistration.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/config/StompBrokerRelayRegistration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -68,6 +68,12 @@ public class StompBrokerRelayRegistration extends AbstractBrokerRegistration {
 	private String userRegistryBroadcast;
 
 
+	/**
+	 * Create a new {@code StompBrokerRelayRegistration}.
+	 * @param clientInboundChannel the inbound channel
+	 * @param clientOutboundChannel the outbound channel
+	 * @param destinationPrefixes the destination prefixes
+	 */
 	public StompBrokerRelayRegistration(SubscribableChannel clientInboundChannel,
 			MessageChannel clientOutboundChannel, String[] destinationPrefixes) {