diff --git a/reference/pdo/constants.xml b/reference/pdo/constants.xml
index f3ae494648..8a8fe11802 100644
--- a/reference/pdo/constants.xml
+++ b/reference/pdo/constants.xml
@@ -311,7 +311,7 @@
    </term>
    <listitem>
     <simpara>
-     Available since PHP 5.2.0
+     Call the constructor before setting properties. Available since PHP 5.2.0.
     </simpara>
    </listitem>
   </varlistentry>