Updated Security library documentation with details on how to whitelist URIs from CSRF protection
diff --git a/user_guide/libraries/security.html b/user_guide/libraries/security.html
index dd62a43..cbe12d8 100644
--- a/user_guide/libraries/security.html
+++ b/user_guide/libraries/security.html
@@ -116,6 +116,9 @@
<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>
+<p>Select URIs can be whitelisted from csrf protection (for example API endpoints expecting externally POSTed content). You can add these URIs by editing the 'csrf_exclude_uris' config parameter:</p>
+<code>$config['csrf_exclude_uris'] = array('api/person/add');</code>
+
</div>
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