diff --git a/user_guide/general/creating_libraries.html b/user_guide/general/creating_libraries.html
index 3f16890..d764641 100644
--- a/user_guide/general/creating_libraries.html
+++ b/user_guide/general/creating_libraries.html
@@ -226,17 +226,24 @@
<h2>Extending Native Libraries</h2>
<p>If all you need to do is add some functionality to an existing library - perhaps add a function or two - then
-it's overkill to replace the entire library with your version. In this case it's better to simply extend the class.</p>
+it's overkill to replace the entire library with your version. In this case it's better to simply extend the class.
+Extending a class is nearly identical to replacing a class with a couple exceptions:</p>
-<p>Extending a class is identical to replacing a class with one exception: The class declaration must extend the parent class
-and your new class must be prefixed with <kbd>MY_</kbd>. For example, to extend the native <kbd>Email</kbd> class
-you'll create a file named <dfn>application/libraries/Email.php</dfn>, and declare your class with:</p>
+<ul>
+<li>The class declaration must extend the parent class.</li>
+<li>Your new class name and filename must be prefixed with <kbd>MY_</kbd> (this item is configurable. See below.).</li>
+</ul>
+
+<p>For example, to extend the native <kbd>Email</kbd> class you'll create a file named <dfn>application/libraries/</dfn><kbd>MY_Email.php</kbd>, and declare your class with:</p>
<code>
class MY_Email extends CI_Email {<br /><br />
}</code>
+<p>Note: If you need to use a constructor in your class make sure you extend the parent constructor:</p>
+
+
<code>
class MY_Email extends CI_Email {<br />
<br />
@@ -246,9 +253,13 @@
}<br />
}</code>
-<p class="important"><strong>Important:</strong> To tell Code Igniter to load your sub-class you MUST include <kbd>my_</kbd> in the loading function:</p>
-<code>$this->load->library('<kbd>my_</kbd>email');</code>
+<h3>Loading Your Sub-class</h3>
+
+<p>To load your sub-class you'll use the standard syntax normally used. DO NOT include your prefix. For example,
+to load the example above, which extends the Email class, you will use:</p>
+
+<code>$this->load->library('<kbd>email</kbd>');</code>
<p>Once loaded you will use the class variable as you normally would for the class you are extending. In the case of
the email class all calls will use:
@@ -256,6 +267,17 @@
<code>$this-><kbd>email</kbd>->some_function();</code>
+
+<h3>Setting Your Own Prefix</h3>
+
+<p>To set your own sub-class prefix, open your <dfn>application/config/config.php</dfn> file and look for this item:</p>
+
+<code>$config['subclass_prefix'] = 'MY_';</code>
+
+<p>Please note that all native Code Igniter libraries are prefixed with <kbd>CI_</kbd> so DO NOT use that as your prefix.</p>
+
+
+
</div>
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