diff --git a/reference/pdo_firebird/constants.xml b/reference/pdo_firebird/constants.xml
index 292e67fb84..326985cc67 100644
--- a/reference/pdo_firebird/constants.xml
+++ b/reference/pdo_firebird/constants.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
 <section xml:id="pdo-firebird.constants" xmlns="http://docbook.org/ns/docbook">
  &reftitle.constants;
  &pdo.driver-constants;
@@ -13,6 +13,9 @@
     <para>
      Available since PHP 5.3.0.
     </para>
+    <para>
+     Sets the date format.
+    </para>
    </listitem>
   </varlistentry>
   <varlistentry>
@@ -21,6 +24,9 @@
      (<type>integer</type>)
    </term>
    <listitem>
+    <para>
+     Sets the time format.
+    </para>
     <para>
      Available since PHP 5.3.0.
     </para>
@@ -32,6 +38,9 @@
      (<type>integer</type>)
    </term>
    <listitem>
+    <para>
+     Sets the timestamp format.
+    </para>
     <para>
      Available since PHP 5.3.0.
     </para>