Update README.md from readme.txt updates.

README.md

@@ -28,6 +28,8 @@ To support older browsers as well, a lightweight JavaScript polyfill is included
 
 For relevant browser support, see:
 * [CSS Scroll-behavior](https://caniuse.com/css-scroll-behavior)
+* [CSS property: scroll-padding-top](https://caniuse.com/mdn-css_properties_scroll-padding-top)
+* [prefers-reduced-motion media query](https://caniuse.com/prefers-reduced-motion)
 * [requestAnimationFrame](https://caniuse.com/requestanimationframe)
 * [High Resolution Time API](https://caniuse.com/high-resolution-time)
 * [NodeList API](https://caniuse.com/mdn-api_nodelist)
@@ -49,6 +51,30 @@ composer require felixarntz/fast-smooth-scroll:^1.0.0-beta.1
 
 This plugin doesn't come with a settings screen or options of any kind. You install it, and it just works.
 
+### Why is the scrolling slightly off vertically?
+
+If the anchor scrolling doesn't end up in exactly the right place, there is a good chance this is happening because your site uses a fixed header or another element that overlaps the main content.
+
+For such situations, the plugin supports setting a scroll offset. You can use the filter `fast_smooth_scroll_offset` to set such an offset in pixels (default is 0, i.e. no offset).
+
+For example, with the following code you would set a scroll offset of 120 pixels. This works for both the default CSS-only implementation as well as for the JavaScript polyfill.
+
+```php
+<?php
+
+function myplugin_get_custom_scroll_offset() {
+	return 120;
+}
+add_filter( 'fast_smooth_scroll_offset', 'myplugin_get_custom_scroll_offset' );
+
+```
+
+### Does the plugin support reduced motion preferences?
+
+Yes! For better accessibility, clients that are configured to reduce motion will not be affected by the smooth scroll behavior.
+
+The `prefers-reduced-motion` media query is used to detect such a preference. Note that this only works with the CSS-only solution, as the older browsers that would require the JavaScript polyfill do not support this preference.
+
 ### I don't care about smooth scrolling for older browsers. How can I disable the JavaScript polyfill?
 
 Since the JavaScript polyfill is only loaded when needed and is extremely lightweight, there's probably not much value in disabling it. However, if you want to go for the purist solution of only relying on the CSS approach, you can certainly do so, using the built-in filter `fast_smooth_scroll_enqueue_scripts`, which defaults to `true`.