Minor reword

Author: javiereguiluz

performance.rst

@@ -108,13 +108,13 @@ Starting from PHP 7.4, OPcache can compile and load classes at start-up and
 make them available to all requests until the server is restarted, improving
 performance significantly.
 
-During container compilation, Symfony generates the file with the list of
-classes to preload. The only requirement is that you need to set both
-``container.dumper.inline_factories`` and  ``container.dumper.inline_class_loader``
-parameters to ``true``.
+During container compilation (e.g. when running the ``cache:clear`` command),
+Symfony generates a file called ``.preload`` (with a leading ``.``) in the
+``src/`` directory with the list of classes to preload.
 
-This preload file is generated by the ``cache:clear`` command and will be located in
-your ``src/`` directory:
+The only requirement is that you need to set both ``container.dumper.inline_factories``
+and ``container.dumper.inline_class_loader`` parameters to ``true``. Then, you
+can configure PHP to use this preload file:
 
 .. code-block:: ini