diff --git a/reference/pdo_mysql/constants.xml b/reference/pdo_mysql/constants.xml
index c55ebd9304..98cc17565b 100644
--- a/reference/pdo_mysql/constants.xml
+++ b/reference/pdo_mysql/constants.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.6 $ -->
+<!-- $Revision: 1.7 $ -->
 <section id="pdo-mysql.constants">
  &reftitle.constants;
  &pdo.driver-constants;
@@ -88,7 +88,7 @@ if ($db->getAttribute(PDO::ATTR_DRIVERNAME) == 'mysql') {
    </term>
    <listitem>
     <para>
-     Maximum buffer size. Defaults to 1 MB.
+     Maximum buffer size. Defaults to 1 MiB.
     </para>
    </listitem>
   </varlistentry>