diff --git a/README.md b/README.md
index 89d14ed..eb93e11 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ Online demo: <https://react-component.github.io/tooltip/demo>
 | afterVisibleChange   | (visible: boolean) => void;               |                     | Callback after visible change                                                                                                                                    |
 | overlay              | ReactNode \| () => ReactNode              |                     | tooltip overlay content                                                                                                                                          |
 | overlayStyle         | object                                    |                     | deprecated, Please use `styles={{ root: {} }}`                                                                                                                                         |
-| overlayClassName     | string                                    |                     | deprecated Please use `classNames={{ root: {} }}`                                                                                                                                 |
+| overlayClassName     | string                                    |                     | deprecated, Please use `classNames={{ root: {} }}`                                                                                                                                 |
 | prefixCls            | string                                    | 'rc-tooltip'        | prefix class name of tooltip                                                                                                                                     |
 | mouseEnterDelay      | number                                    | 0                   | delay time (in second) before tooltip shows when mouse enter                                                                                                     |
 | mouseLeaveDelay      | number                                    | 0.1                 | delay time (in second) before tooltip hides when mouse leave                                                                                                     |