diff --git a/reference/mongo/writes.xml b/reference/mongo/writes.xml
index 9c93207ede..bf70c297de 100644
--- a/reference/mongo/writes.xml
+++ b/reference/mongo/writes.xml
@@ -57,8 +57,8 @@ $blog->update($criteria, array('$set' => array("comments.1" => array("author" =>
 <?php
 
 $blog->update(
-    array("comments.author" => "John"), 
-    array('$set' => array('comments.$.author' => "Jim")));
+    array('comments.author' => 'John'), 
+    array('$set' => array('comments.$.author' => 'Jim')));
 
 ?>
 ]]>