Improve readme file

Author: goinnn

README.rst

@@ -129,7 +129,7 @@ For WNS, you need both the ``WNS_PACKAGE_SECURITY_KEY`` and the ``WNS_SECRET_KEY
 
 - ``WP_PRIVATE_KEY``: Absolute path to your private certificate file: os.path.join(BASE_DIR, "private_key.pem")
 - ``WP_CLAIMS``: Dictionary with default value for the sub, (subject), sent to the webpush service, This would be used by the service if they needed to reach out to you (the sender). Could be a url or mailto e.g. {'sub': "mailto:[email protected]"}.
-- ``WP_ERROR_TIMEOUT``: The timeout on WebPush POSTs. (Optional)
+- ``WP_ERROR_TIMEOUT``: The timeout on WebPush POSTs. (Optional, default value is 1 second)
 
 For more information about how to configure WebPush, see `docs/WebPush <https://github.com/jazzband/django-push-notifications/blob/master/docs/WebPush.rst>`_.