diff --git a/user_guide/libraries/security.html b/user_guide/libraries/security.html
index 5cd2747..943f72a 100644
--- a/user_guide/libraries/security.html
+++ b/user_guide/libraries/security.html
@@ -104,11 +104,18 @@
 
 <p>If it is acceptable for the user input to include relative paths, e.g. <kbd>file/in/some/approved/folder.txt</kbd>, you can set the second optional parameter,
 	<samp>$relative_path</samp> to TRUE.</p>
-	
+
 <code>$filename = $this->security->sanitize_filename($this->input->post('filename'), TRUE);</code>
 
 <!-- @todo write docs for CSRF methods -->
 
+<h2>Cross-site request forgery (CSRF)</h2>
+
+<p>You can enable csrf protection by opening your <kbd>application/config/config.php</kbd> file and setting this:</p>
+<code>$config['csrf_protection'] = TRUE;</code>
+
+<p>If you use the <a href="../helpers/form_helper.html">form helper</a> the <var>form_open()</var> function will automatically insert a hidden csrf field in your forms.</p>
+
 </div>
 <!-- END CONTENT -->