Explain that props are updated on navigation

src/content/docs/en/guides/view-transitions.mdx

@@ -134,6 +134,8 @@ As a convenient shorthand, `transition:persist` can alternatively take a transit
 <video controls="" autoplay="" transition:persist="media-player">
 ```
 
+When you add `transition:persist` to an island, the state is retained upon navigation, but any props that change will be carried over to the new page, causing your component to re-render with new props, but the existing state. You can control this behavior with the `transition:persist-props` directive. Adding this directive will keep the existing props and not copy over new values.
+
 ### Built-in Animation Directives
 
 Astro comes with a few built-in animations to override the default `fade` transition. Add the `transition:animate` directive to individual elements to customize the behavior of specific transitions.