diff --git a/README.md b/README.md
index 87767b3..87e554e 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,7 @@ npm start
 | onDelete\*         | (task: Task) => void/boolean/Promise<void>/Promise<boolean>                   | Specifies the function to be executed on the taskbar on Delete button press event.      |
 | onDateChange\*     | (task: Task, children: Task[]) => void/boolean/Promise<void>/Promise<boolean> | Specifies the function to be executed when drag taskbar event on timeline has finished. |
 | onProgressChange\* | (task: Task, children: Task[]) => void/boolean/Promise<void>/Promise<boolean> | Specifies the function to be executed when drag taskbar progress event has finished.    |
+| onExpanderClick\*  | onExpanderClick: (task: Task) => void;                                        | Specifies the function to be executed on the table expander click                       |
 | timeStep           | (task: Task) => number                                                        | A time step value for onDateChange. Specify in milliseconds.                            |
 
 \* Chart undoes operation if method return false or error. Parameter children returns one level deep records.