diff --git a/reference/mysql/constants.xml b/reference/mysql/constants.xml
index 8938a893f2..da6b13c22f 100644
--- a/reference/mysql/constants.xml
+++ b/reference/mysql/constants.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.4 $ -->
+<!-- $Revision: 1.5 $ -->
 <section id="mysql.constants">
  &reftitle.constants;
  &extension.constants;
@@ -30,6 +30,12 @@
        <entry>Allow interactive_timeout seconds (instead of wait_timeout) of
         inactivity before closing the connection.</entry>
       </row>
+      <row>
+       <entry>MYSQL_CLIENT_SSL</entry>
+       <entry>Use SSL encryption. This flag is available only with 4.x version
+        of client library or newer. Version 3.23.x is bundled both with PHP 4
+        and PHP 5.</entry>
+      </row>
      </tbody>
     </tgroup>
   </table>