More README notes

darrenburns · Dec 7, 2022 · 3a20f09 · 3a20f09
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 As shown in the quickstart, you can wrap the Textual builtin `Input` widget with
 `AutoComplete`, and supply a `Dropdown`. 
 The `AutoComplete` manages communication between the `Input` and the `Dropdown`.
+
 The `Dropdown` is the widget you see on screen, as you type into the input.
 
+The `DropdownItem`s contain up to 3 columns. All must contain a "main" column, which
+is the central column used in the filtering. They can also optionally contain a left and right metadata
+column.
+
 ### Supplying data to `Dropdown`
 
 You can supply the data for the dropdown via a list or a callback function.