adding sanitize_filename() into the security helper
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index fb39d60..714e9e8 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -127,6 +127,7 @@
<li>Modified <kbd>smiley_js()</kbd> to add optional third parameter to return only the javascript with no script tags.</li>
<li>The <kbd>img()</kbd> function of the <a href="./helpers/html_helper.html">HTML helper</a> will now generate an empty string as an alt attribute if one is not provided.</li>
<li>If CSRF is enabled in the application config file, <kbd>form_open()</kbd> will automatically insert it as a hidden field.</li>
+ <li>Added <kbd>sanitize_filename()</kbd> into the <a href="./helpers/security_helper.html">Security helper</a>.</li>
</ul>
</li>
<li>Other Changes