feed.xml in beautiful-jekyll-theme-4.1.0 vs feed.xml in beautiful-jekyll-theme-5.0.0

@@ -5,20 +5,21 @@
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   <channel>
     {% if site.title %}
     <title>{{ site.title | xml_escape }}</title>
     {% endif %}
-    {% if site.description %}
-    <description>{{ site.description | xml_escape }}</description>
+    {% if site.rss-description %}
+    <description>{{ site.rss-description | xml_escape }}</description>
     {% endif %}
     <link>{{ '' | absolute_url }}</link>
     <atom:link href="{{ 'feed.xml' | absolute_url }}" rel="self" type="application/rss+xml" />
+    {% assign excerpt_length = site.excerpt_length | default: 50 %}
     {% for post in site.posts limit:20 %}
       <item>
         <title>{{ post.title | xml_escape }}</title>
         <description>
           {% if post.subtitle %}{{ post.subtitle | xml_escape }} - {% endif %}
-          {{ post.content | strip_html | xml_escape | truncatewords: 50 }}
+          {{ post.content | strip_html | xml_escape | truncatewords: excerpt_length }}
         </description>
         <pubDate>{{ post.date | date: "%a, %d %b %Y %H:%M:%S %z" }}</pubDate>
         <link>{{ post.url | absolute_url }}</link>
         <guid isPermaLink="true">{{ post.url | absolute_url }}</guid>
       </item>