diff --git a/reference/pdo/pdo/errorcode.xml b/reference/pdo/pdo/errorcode.xml
index 12c74bd0b4..9ba112d2a2 100644
--- a/reference/pdo/pdo/errorcode.xml
+++ b/reference/pdo/pdo/errorcode.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <refentry xml:id="pdo.errorcode" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>PDO::errorCode</refname>
@@ -10,7 +10,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>string</type><methodname>PDO::errorCode</methodname>
+   <type>mixed</type><methodname>PDO::errorCode</methodname>
    <void/>
   </methodsynopsis>
 
@@ -38,6 +38,9 @@
    You must call <function>PDOStatement::errorCode</function> to return the error
    code for an operation performed on a particular statement handle.
   </para>
+  <para>
+   Returns &null; if no operation has been run on the database handle.
+  </para>
  </refsect1>
 
  <refsect1 role="examples">
diff --git a/reference/pdo/pdo/errorinfo.xml b/reference/pdo/pdo/errorinfo.xml
index 69ce7249d9..9a080386d4 100644
--- a/reference/pdo/pdo/errorinfo.xml
+++ b/reference/pdo/pdo/errorinfo.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <refentry xml:id="pdo.errorinfo" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>PDO::errorInfo</refname>
@@ -49,6 +49,13 @@
    </informaltable>
   </para>
 
+  <note>
+   <para>
+    If the SQLSTATE error code is not set or there is no driver-specific
+    error, the elements following element 0 will be set to &null;.
+    </para>
+  </note>
+
   <para>
    <function>PDO::errorInfo</function> only retrieves error information for
    operations performed directly on the database handle. If you create a