docs(readme): add information for upgrading to v4.x

myparcelnl · Oct 30, 2024 · 30e8191 · 30e8191
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@@ -20,6 +20,10 @@ This module allows you to seamlessly integrate [the MyParcel services] into your
 
 For the manual and more information, check out our [PrestaShop module guide] on the [MyParcel Developer Portal].
 
+### Upgrading to v4.x
+
+When upgrading to v4.x it is necessary to clear the cache of Prestashop. To do so, go to `Advanced Parameters` -> `Performance` and click on `Clear cache`.
+
 ## Contributing
 
 See [CONTRIBUTING.md](./CONTRIBUTING.md).