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diff --git a/README.md b/README.md
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@@ -20,6 +20,9 @@ chores).
 
 ## Product
 
+**Refocus refresh** — returning to the app after 10 seconds away refetches
+the current page's data; edit pages are left untouched.
+
 ### Groceries
 
 Two core concepts: the **catalog** (every item you've ever added) and the