diff --git a/user_guide/installation/upgrade_150.html b/user_guide/installation/upgrade_150.html
index 06d0c70..79632ec 100644
--- a/user_guide/installation/upgrade_150.html
+++ b/user_guide/installation/upgrade_150.html
@@ -155,7 +155,13 @@
<h2>Step 4: Update your main index.php file</h2>
<p>If you are running a stock <dfn>index.php</dfn> file simply replace your version with the new one. If you are running one with
-internal modifications, open it and add this line of code near the bottom:</p>
+internal modifications, open it and make these two changes:</p>
+
+<p>Find the $application_folder variable and make sure it contains the name of your "application" directory:</p>
+
+<code>$application_folder = "application";</code>
+
+<p>Next, at add this line of code near the bottom of the page:</p>
<code>define('FCPATH', __FILE__);</code>