To add another unusual item:

If the unusual item needs a defined ~token, add that in makeDefineUnusualSpt() in scripts.js.

Add it in ~all_unusual in scripts.js

Add it in alertUnusual() in help1.js

List it in notes.htm#unusual

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Primary call to alertUnusual() (unconditional) is in
doPostLoadActions() in top.js
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Fewer details mode:

preferenceSayUnusual is newly false by default in FG3.1

togglePreferenceDetails() in prefs.js calls togglePreferenceSayUnusual() which
does alertUnusual() when going to details.