diff --git a/README.md b/README.md
index 0312549..888a40e 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ More examples can be found [here ↗](https://react-multi-select-component.pages
 | `options`             | options for dropdown                                                                                                                              | `[{label, value, disabled}]` |                |
 | `value`               | pre-selected rows                                                                                                                                 | `[{label, value}]`           | `[]`           |
 | `hasSelectAll`        | toggle 'Select All' option                                                                                                                        | `boolean`                    | `true`         |
+| `defaultIsOpen`       | is dropdown open by default                                                                                                                       | `boolean`                    | `undefined`        |
 | `isLoading`           | show spinner on select                                                                                                                            | `boolean`                    | `false`        |
 | `shouldToggleOnHover` | toggle dropdown on hover option                                                                                                                   | `boolean`                    | `false`        |
 | `overrideStrings`     | [localization ↗](stories/recipes/localization.stories.mdx)                                                                                                    | `object`                     |                |