diff --git a/reference/pcre/constants.xml b/reference/pcre/constants.xml
index dfe64b4848..17fc54fcd4 100644
--- a/reference/pcre/constants.xml
+++ b/reference/pcre/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
 <section id="pcre.constants">
  &reftitle.constants;
  &extension.constants;
@@ -64,6 +64,40 @@
       and is only used for <function>preg_split</function>.
      </entry>
     </row>
+    <row>
+     <entry>PREG_NO_ERROR</entry>
+     <entry>
+      Returned by <function>preg_last_error</function> if there were no errors.
+     </entry>
+    </row>
+    <row>
+     <entry>PREG_INTERNAL_ERROR</entry>
+     <entry>
+      Returned by <function>preg_last_error</function> if there was an
+      internal PCRE error.
+     </entry>
+    </row>
+    <row>
+     <entry>PREG_BACKTRACK_LIMIT_ERROR</entry>
+     <entry>
+      Returned by <function>preg_last_error</function> if backtrack limit was
+      exhausted.
+     </entry>
+    </row>
+    <row>
+     <entry>PREG_RECURSION_LIMIT_ERROR</entry>
+     <entry>
+      Returned by <function>preg_last_error</function> if recursion limit was
+      exhausted.
+     </entry>
+    </row>
+    <row>
+     <entry>PREG_BAD_UTF8_ERROR</entry>
+     <entry>
+      Returned by <function>preg_last_error</function> if the last error was
+      caused by invalid UTF8 data.
+     </entry>
+    </row>
    </tbody>
   </tgroup>
  </table>