Update README.md

README.md

@@ -65,7 +65,7 @@ import InfiniteScroll from 'react-infinite-scroller';
 | `initialLoad`    | `Boolean`     | `true`     | Whether the component should load the first set of items.|
 | `isReverse`      | `Boolean`     | `false`    | Whether new items should be loaded when user scrolls to the top of the scrollable area.|
 | `loadMore`       | `Function`    |            | A callback when more items are requested by the user. Receives a single parameter specifying the page to load e.g. `function handleLoadMore(page) { /* load more items here */ }` }|
-| `loader`         | `Component`   |            | A React component to render while more items are loading. Make sure to give it a unique key prop. |
+| `loader`         | `Component`   |            | A React component to render while more items are loading. The parent component must have a unique key prop. |
 | `pageStart`      | `Number`      | `0`        | The number of the first page to load, With the default of `0`, the first page is `1`.|
 | `threshold`      | `Number`     | `250`      | The distance in pixels before the end of the items that will trigger a call to `loadMore`.|
 | `useCapture`     | `Boolean`     | `false`     | Proxy to the `useCapture` option of the added event listeners.|