diff --git a/html_calendar.xsl b/html_calendar.xsl
index 8107660..2c098bf 100755
--- a/html_calendar.xsl
+++ b/html_calendar.xsl
@@ -1,4 +1,9 @@
 <?xml version="1.0"?>
+
+<!--
+	THE USE OF THIS STYLESHEET IS DEPRECATED AS OF 2012-06-18! It has been replaced by equivalent markup embedded within the overall XML authoring framework. This file will stay here to provide backward compatibility with older markup that uses it.
+-->
+
 <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 
 	<xsl:output method="html" encoding="ISO-8859-1" media-type="text/html" doctype-public="-//W3C//DTD HTML 4.01//EN" doctype-system="http://www.w3.org/TR/html4/strict.dtd" />