diff --git a/components/runtime.rst b/components/runtime.rst
index fac78dd82dd..7b187acaeee 100644
--- a/components/runtime.rst
+++ b/components/runtime.rst
@@ -329,6 +329,9 @@ You can also configure ``extra.runtime`` in ``composer.json``:
         }
     }
 
+Then, update your Composer files (running ``composer dump-autoload``, for instance),
+so that the ``vendor/autoload_runtime.php`` files gets regenerated with the new option.
+
 The following options are supported by the ``SymfonyRuntime``:
 
 ``env`` (default: ``APP_ENV`` environment variable, or ``"dev"``)
diff --git a/configuration/override_dir_structure.rst b/configuration/override_dir_structure.rst
index 73f65c9171f..808fb6f923f 100644
--- a/configuration/override_dir_structure.rst
+++ b/configuration/override_dir_structure.rst
@@ -49,7 +49,7 @@ define the ``runtime.dotenv_path`` option in the ``composer.json`` file:
         }
     }
 
-Then, update your Composer files (running ``composer update``, for instance),
+Then, update your Composer files (running ``composer dump-autoload``, for instance),
 so that the ``vendor/autoload_runtime.php`` files gets regenerated with the new
 ``.env`` path.