diff --git a/reference/json/constants.xml b/reference/json/constants.xml
index 0b8133ab47..e1619d2cd8 100644
--- a/reference/json/constants.xml
+++ b/reference/json/constants.xml
@@ -54,6 +54,18 @@
     </simpara>
    </listitem>
   </varlistentry>
+  <varlistentry>
+   <term>
+    <constant>JSON_ERROR_UTF8</constant>
+     (<type>integer</type>)
+   </term>
+   <listitem>
+    <simpara>
+     Malformed UTF-8 characters, possibly incorrectly encoded. This 
+     constant is available as of PHP 5.3.1.
+    </simpara>
+   </listitem>
+  </varlistentry>
  </variablelist>
 
  <para>
diff --git a/reference/json/functions/json-last-error.xml b/reference/json/functions/json-last-error.xml
index 9c2dfe21c2..f50cceee00 100644
--- a/reference/json/functions/json-last-error.xml
+++ b/reference/json/functions/json-last-error.xml
@@ -35,24 +35,34 @@
      <row>
       <entry>Constant</entry>
       <entry>Meaning</entry>
+      <entry>Availability</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry><constant>JSON_ERROR_NONE</constant></entry>
       <entry>No error has occurred</entry>
+      <entry></entry>
      </row>
      <row>
       <entry><constant>JSON_ERROR_DEPTH</constant></entry>
       <entry>The maximum stack depth has been exceeded</entry>
+      <entry></entry>
      </row>
      <row>
       <entry><constant>JSON_ERROR_CTRL_CHAR</constant></entry>
       <entry>Control character error, possibly incorrectly encoded</entry>
+      <entry></entry>
      </row>
      <row>
       <entry><constant>JSON_ERROR_SYNTAX</constant></entry>
       <entry>Syntax error</entry>
+      <entry></entry>
+     </row>
+     <row>
+      <entry><constant>JSON_ERROR_UTF8</constant></entry>
+      <entry>Malformed UTF-8 characters, possibly incorrectly encoded</entry>
+      <entry>PHP 5.3.1</entry>
      </row>
     </tbody>
    </tgroup>