Fixed double-space typo.
diff --git a/user_guide/installation/upgrade_152.html b/user_guide/installation/upgrade_152.html
index f601a25..136e309 100644
--- a/user_guide/installation/upgrade_152.html
+++ b/user_guide/installation/upgrade_152.html
@@ -57,7 +57,7 @@
<h1>Upgrading from 1.5.0 to 1.5.2</h1>
-<p class="important"><strong>Note:</strong> The instructions on this page assume you are running version 1.5.0 or 1.5.1. If you
+<p class="important"><strong>Note:</strong> The instructions on this page assume you are running version 1.5.0 or 1.5.1. If you
have not upgraded to that version please do so first.</p>
<p>Before performing an update you should take your site offline by replacing the index.php file with a static one.</p>