diff --git a/_posts/2011-03-10-sample-post.md b/_posts/2011-03-10-sample-post.md
index 20da7ef6..62112a74 100644
--- a/_posts/2011-03-10-sample-post.md
+++ b/_posts/2011-03-10-sample-post.md
@@ -2,6 +2,7 @@
 layout: post
 title: Sample Post
 description: "Just about everything you'll need to style in the theme: headings, paragraphs, blockquotes, tables, code blocks, and more."
+modified: 2013-05-31
 category: articles
 tags: [intro, beginner, jekyll, tutorial]
 image:
@@ -93,3 +94,9 @@ HTML and CSS are our tools. Mauris a ante. Suspendisse quam sem, consequat at, c
 Make any link standout more when applying the `.btn` class.
 
 <div markdown="0"><a href="#" class="btn">This is a button</a></div>
+
+<div markdown="0"><a href="#" class="btn btn-inverse">This is an inverse button</a></div>
+
+<div markdown="0"><a href="#" class="btn btn-small">This is small button</a></div>
+
+<div markdown="0"><a href="#" class="btn btn-inverse btn-small">Small inverse button</a></div>
diff --git a/feed.xml b/feed.xml
index e1cd2ccb..8b094697 100644
--- a/feed.xml
+++ b/feed.xml
@@ -21,9 +21,8 @@ layout: none
   <title type="html"><![CDATA[{{ post.title | cdata_escape }}]]></title>
   <link rel="alternate" type="text/html" href="{{ site.url }}{{ post.url }}" />
   <id>{{ site.url }}{{ post.id }}</id>
-  {% if post.modified %}<updated>{{ post.modified | date_to_xmlschema }}</updated>
   <published>{{ post.date | date_to_xmlschema }}</published>
-  {% else %}<updated>{{ post.date | date_to_xmlschema }}</updated>{% endif %}
+  {% if post.modified %}<updated>{{ post.modified | to_xmlschema }}</updated>{% endif %}
   <author>
     <name>{{ site.owner.name }}</name>
     <uri>{{ site.url }}/</uri>