Explain "...tinymce.html".

README.md

@@ -32,3 +32,8 @@ resulting in single-line paragraphs and list items.
 As yet, those single lines have not been copied back to this repo
 over concern of degrading the ability to track changes.
 
+In the case of "news/7-agenda", there are in fact, two version of the HTML file:
+
+  * "7-agenda.frag-tinymce.html" contains HTML fragment after it has been
+    rewritten by the TinyMCE editor.  (Wrapper structure disappears.)
+  * "7-agenda.frag.html" is the structured form.