typo fix, $this->Db to $this->db
diff --git a/user_guide/database/active_record.html b/user_guide/database/active_record.html
index 4273896..5425f01 100644
--- a/user_guide/database/active_record.html
+++ b/user_guide/database/active_record.html
@@ -139,7 +139,7 @@
// Produces: SELECT title, content, date FROM mytable</code></p>
<p class="important"><strong>Note:</strong> If you are selecting all (*) from a table you do not need to use this function. When omitted, CodeIgniter assumes you wish to SELECT *</p>
-<p>$this->Db->select() accepts an optional second parameter. If you set it to FALSE, CodeIgniter will not try to protect your field or table names with backticks. This is useful if you need a compound select statement.</p>
+<p>$this->db->select() accepts an optional second parameter. If you set it to FALSE, CodeIgniter will not try to protect your field or table names with backticks. This is useful if you need a compound select statement.</p>
<p><code> $this->db->select('(SELECT SUM(payments.amount) FROM payments WHERE payments.invoice_id=4') AS amount_paid', FALSE); <br />
$query = $this->db->get('mytable');<br />
</code></p>