diff --git a/reference/pdo/pdostatement/fetchall.xml b/reference/pdo/pdostatement/fetchall.xml
index 4fd4a00eb6..c78ba185e1 100644
--- a/reference/pdo/pdostatement/fetchall.xml
+++ b/reference/pdo/pdostatement/fetchall.xml
@@ -12,7 +12,7 @@
   <methodsynopsis>
    <type>array</type><methodname>PDOStatement::fetchAll</methodname>
    <methodparam choice="opt"><type>int</type><parameter>fetch_style</parameter><initializer>PDO::FETCH_BOTH</initializer></methodparam>
-   <methodparam choice="opt"><type>int</type><parameter>column_index</parameter><initializer>0</initializer></methodparam>
+   <methodparam choice="opt"><type>int</type><parameter>fetch_argument</parameter><initializer>0</initializer></methodparam>
    <methodparam choice="opt"><type>array</type><parameter>ctor_args</parameter><initializer>array()</initializer></methodparam>
   </methodsynopsis>
 
@@ -48,12 +48,25 @@
      </listitem>
     </varlistentry>
     <varlistentry>
-     <term><parameter>column_index</parameter></term>
+     <term><parameter>fetch_argument</parameter></term>
      <listitem>
       <para>
-       Returns the indicated 0-indexed column when the value of
-       <parameter>fetch_style</parameter> is
-       <literal>PDO::FETCH_COLUMN</literal>.
+       This argument have a different meaning depending on the value of 
+       the <parameter>fetch_style</parameter> parameter:
+       <itemizedlist>
+        <listitem>
+         <para>
+          <constant>PDO::FETCH_COLUMN</constant>: Returns the indicated 0-indexed 
+           column.
+         </para>
+        </listitem>
+        <listitem>
+         <para>
+          <constant>PDO::FETCH_CLASS</constant>: Sets a custom class name for which 
+           the fetch results will be stored in.
+         </para>
+        </listitem>
+       </itemizedlist>
       </para>
      </listitem>
     </varlistentry>
@@ -61,7 +74,8 @@
      <term><parameter>ctor_args</parameter></term>
      <listitem>
       <para>
-       Arguments of custom class constructor.
+       Arguments of custom class constructor when the <parameter>fetch_style</parameter> 
+       parameter is <constant>PDO::FETCH_CLASS</constant>.
       </para>
      </listitem>
     </varlistentry>