diff --git a/frontend/asset_mapper.rst b/frontend/asset_mapper.rst
index 17a80af3fce..37ff51cb5d1 100644
--- a/frontend/asset_mapper.rst
+++ b/frontend/asset_mapper.rst
@@ -1031,15 +1031,31 @@ you expect are being included in the asset map.
``framework.asset_mapper.importmap_polyfill``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-Configure the polyfill for older browsers. Default is `ES module shim`_. You can pass
-any URL to be included, or ``false`` to disable the polyfill.
+Configure the polyfill for older browsers. By default, the `ES module shim`_ is loaded
+via a CDN. You can pass the key of an item in ``importmap.php`` or ``false`` to disable
+the polyfill loading.
.. code-block:: yaml
framework:
asset_mapper:
importmap_polyfill: false # disable the shim ...
- # importmap_polyfill: 'https://...' # ... or pass some custom URL
+ # importmap_polyfill: 'my_import_map' # ... or pass an importmap name
+
+.. tip::
+
+ You can tell the AssetMapper to load the `ES module shim`_ locally by
+ using the following command, without changing your configuration:
+
+ .. code-block:: terminal
+
+ $ php bin/console importmap:require es-module-shims
+
+.. versionadded:: 6.4
+
+ Passing an importmap name in ``importmap_polyfill`` was
+ introduced in Symfony 6.4. Prior to this, you could pass ``false``
+ or a custom URL to load the polyfill.
``framework.asset_mapper.importmap_script_attributes``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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