Any of us can add it. Up user he article there is a tab for add keyword. Click it. Type in your word Hit tab and its added and you return to article. Easy peasy. Folks just forget we have this feature.
When a word is used repeatedly it automatically appears o. The most frequent used list. It when multiple words for the same subject are used that finding articles becomes difficult or are missed.
I’ve also used a select key for my own personal bookmark. Works better than saving to computer and digging there
Thank You ... your information has been helpful to one (me) that knows so little.