-<!if this file ./Documentation/footer.html.in is present, it is included>
-<!automatically by add-html-footer, and replaces the simple standard footer>
-<!substitutions: package.Name, package.Name, ENV:WEBMASTER, ENV:WEBMASTER>
+<!--
+
+if this file ./Documentation/footer.html.in is present, it is included
+
+automatically by add-html-footer, and replaces the simple standard
+footer substitutions:
+
+ * index,
+ * package name
+ * package name
+ * ENV:WEBMASTER,
+ * ENV:WEBMASTER
+
+>
+