New extension VK_KHR_incremental_present. What it did gives ?

VK_KHR_incremental_present what it did gives ?
Where is to read about VK_KHR_incremental_present ?

This device extension extends vkQueuePresentKHR, from the VK_KHR_swapchain extension, allowing an application to specify a list of rectangular, modified regions of each image to present. This should be used in situations where an application is only changing a small portion of the presentable images within a swapchain, since it enables the presentation engine to avoid wasting time presenting parts of the surface that haven’t changed.