diff --git a/reference/html/appendix.html b/reference/html/appendix.html
index f6bc403b7..b5ac61f35 100644
--- a/reference/html/appendix.html
+++ b/reference/html/appendix.html
@@ -201,7 +201,7 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.enabled</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.feign.enabled</p></td>
@@ -221,12 +221,12 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.http.enabled</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.http.legacy.enabled</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.integration.enabled</p></td>
@@ -256,7 +256,7 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.messaging.jms.remote-service-name</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">jms</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.messaging.kafka.enabled</p></td>
@@ -271,7 +271,7 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.messaging.kafka.remote-service-name</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">kafka</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.messaging.rabbit.enabled</p></td>
@@ -281,12 +281,12 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.messaging.rabbit.remote-service-name</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">rabbitmq</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.opentracing.enabled</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.sleuth.reactor.decorate-on-each</p></td>
@@ -406,7 +406,7 @@ Also, you can define your own properties.
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.zipkin.compression.enabled</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
-<td class="tableblock halign-left valign-top"><p class="tableblock">null</p></td>
+<td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">spring.zipkin.discovery-client-enabled</p></td>