Update readme.md

lib/SearchAndSort/readme.md

@@ -101,6 +101,7 @@ nonInteractiveHeaders | string[] | Columns in the `<MultiColumnList>` which shou
 onCloseNewRecord | func | Callback for when the new record layer is closed
 onComponentWillUnmount | func | Exposes React `componentWillUnmount`. Called with all of this component's props
 onResetAll | func | Callback for when all filters/search is reset/cleared
+resultsOnNeedMore | func | Custom data-fetching function, triggered when getting near the end of the fetched data. Void return, accepts an object with `records`, `source`, `direction`, `index`, `firstIndex`, and `askAmount`
 
 See ui-users' top-level component [`<Users.js>`](https://github.com/folio-org/ui-users/blob/master/Users.js) for an example of how to use `<SearchAndSort>`.