diff --git a/static/xml/feed.xsl b/static/xml/feed.xsl
index 5a43366..3890904 100644
--- a/static/xml/feed.xsl
+++ b/static/xml/feed.xsl
@@ -1,4 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!-- adapted from https://github.com/getnikola/nikola/blob/master/nikola/data/themes/base/assets/xml/rss.xsl -->
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" version="1.0">
 <xsl:output method="xml"/>
 <xsl:template match="/">