Hi,

On https://www.gnu.org/software/emacs/manual/html_node/elisp/Library-Headers.html,

the following statement appears:

>
;;; Change Log:

This begins an optional log of changes to the file over time. Don’t put too much information in this section—it is better to keep the detailed logs in a version control system (as Emacs does) or in a separate ChangeLog file. ‘History’ is an alternative to ‘Change Log’.

However, 'History' is first mentioned in the line above this one (";;; Commentary:") so suggest it should be defined there, if not on a separate line.

2)
 > " Here is a table of the conventional possibilities for header-name:"

It's not clearly stated (but perhaps implied) that the header-names displayed on this page are (currently) the only ones you should use/can be read by builtin Emacs functions.  Can you make up or define your own?

Best,
C. Mayo