diff --git a/reference/mongodb/mongodb/driver/readconcern.xml b/reference/mongodb/mongodb/driver/readconcern.xml
index cee7434d84..c6f9d4cf27 100644
--- a/reference/mongodb/mongodb/driver/readconcern.xml
+++ b/reference/mongodb/mongodb/driver/readconcern.xml
@@ -127,8 +127,14 @@
        <row>
         <entry>1.2.0</entry>
         <entry>
-         Added the <constant>MongoDB\Driver\ReadConcern::LINEARIZABLE</constant>
-         constant.
+         <para>
+          Added the
+          <constant>MongoDB\Driver\ReadConcern::LINEARIZABLE</constant>
+          constant.
+         </para>
+         <para>
+          Implements <interfacename>MongoDB\BSON\Serializable</interfacename>.
+         </para>
         </entry>
        </row>
       </tbody>
diff --git a/reference/mongodb/mongodb/driver/readpreference.xml b/reference/mongodb/mongodb/driver/readpreference.xml
index c7d3e689a0..563b86fa2e 100644
--- a/reference/mongodb/mongodb/driver/readpreference.xml
+++ b/reference/mongodb/mongodb/driver/readpreference.xml
@@ -186,11 +186,16 @@
        <row>
         <entry>1.2.0</entry>
         <entry>
-         Added the
-         <constant>MongoDB\Driver\ReadPreference::NO_MAX_STALENESS</constant>
-         and
-         <constant>MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS</constant>
-         constants.
+         <para>
+          Added the
+          <constant>MongoDB\Driver\ReadPreference::NO_MAX_STALENESS</constant>
+          and
+          <constant>MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS</constant>
+          constants.
+         </para>
+         <para>
+          Implements <interfacename>MongoDB\BSON\Serializable</interfacename>.
+         </para>
         </entry>
        </row>
       </tbody>
diff --git a/reference/mongodb/mongodb/driver/writeconcern.xml b/reference/mongodb/mongodb/driver/writeconcern.xml
index 488f490c1a..c80b4c184e 100644
--- a/reference/mongodb/mongodb/driver/writeconcern.xml
+++ b/reference/mongodb/mongodb/driver/writeconcern.xml
@@ -75,6 +75,29 @@
   </section>
 <!-- }}} -->
 
+  <section role="changelog">
+   &reftitle.changelog;
+   <para>
+    <informaltable>
+     <tgroup cols="2">
+      <thead>
+       <row>
+        <entry>&Version;</entry>
+        <entry>&Description;</entry>
+       </row>
+      </thead>
+      <tbody>
+       <row>
+        <entry>1.2.0</entry>
+        <entry>
+         Implements <interfacename>MongoDB\BSON\Serializable</interfacename>.
+        </entry>
+       </row>
+      </tbody>
+     </tgroup>
+    </informaltable>
+   </para>
+  </section>
 
  </partintro>