diff --git a/options.xhtml b/options.xhtml
index 352db08ba..9c4c657ea 100644
--- a/options.xhtml
+++ b/options.xhtml
@@ -17456,7 +17456,7 @@ one of “background”, “bottom”, “top”, “overlay”</p>
  </span>
 </dt>
 <dd>
-<p>Add a margin around the window to allow for CSS shadow styling</p>
+<p>Add a margin around the window to allow for CSS shadow styling.</p>
 
 <p><span class="emphasis"><em>Type:</em></span>
 signed integer</p>