Added step 2: Replace config/user_agents.php
diff --git a/user_guide/installation/upgrade_210.html b/user_guide/installation/upgrade_210.html
index 9f8204a..6e8ddec 100644
--- a/user_guide/installation/upgrade_210.html
+++ b/user_guide/installation/upgrade_210.html
@@ -63,6 +63,10 @@
<p>Replace all files and directories in your "system" folder and replace your index.php file. If any modifications were made to your index.php they will need to be made fresh in this new one.</p>
+<h2>Step 2: Replace config/user_agents.php</h2>
+
+<p>This config file has been updated to contain more user agent types, please copy it to <kbd>application/config/user_agents.php</kbd>.</p>
+
<p class="important"><strong>Note:</strong> If you have any custom developed files in these folders please make copies of them first.</p>