mdedetrich commented on code in PR #11478:
URL: https://github.com/apache/kafka/pull/11478#discussion_r927536939


##########
core/src/main/scala/kafka/server/KafkaConfig.scala:
##########
@@ -741,12 +741,15 @@ object KafkaConfig {
   /** ********* Socket Server Configuration ***********/
   val ListenersDoc = "Listener List - Comma-separated list of URIs we will 
listen on and the listener names." +
     s" If the listener name is not a security protocol, 
<code>$ListenerSecurityProtocolMapProp</code> must also be set.\n" +
-    " Listener names and port numbers must be unique.\n" +
+    " Listener names and port numbers must be unique unless \n" +
+    " one listener is an IPv4 address and the other listener is \n" +
+    " an IPv6 address (for the same port).\n" +

Review Comment:
   I prefer it like this because even though its more verbose I find its more 
explicit/clear but I can change it if you feel strongly about it



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