Now and again it’s handy to add some additional information (also known as metadata) to a document, that doesn’t appear in the text of the document itself.
You can add such a description to a document or other file by checking the file and then opening the Activity pane (click the ⓘ button):
Then click on Details:
Scroll down, and you’ll see the file details and a Description field where you can add text:
The description text is searchable. In the search result shown below, the only search term used in the search bar was ‘elephants’, which appears in the description of our example document but not in the document itself. Nevertheless, the document has been found by the search, due to its metadata: