diff --git a/cookbook/request/load_balancer_reverse_proxy.rst b/cookbook/request/load_balancer_reverse_proxy.rst
index e23e0ac01c2..60c8d23ff0d 100644
--- a/cookbook/request/load_balancer_reverse_proxy.rst
+++ b/cookbook/request/load_balancer_reverse_proxy.rst
@@ -83,6 +83,9 @@ In this case, you'll need to - *very carefully* - trust *all* proxies.
        $response = $kernel->handle($request);
        // ...
 
+#. Ensure that the trusted_proxies setting in your ``app/config/config.yml`` 
+   is not set or it will overwrite the ``setTrustedProxies`` call above.
+
 That's it! It's critical that you prevent traffic from all non-trusted sources.
 If you allow outside traffic, they could "spoof" their true IP address and
 other information.