diff --git a/UPGRADE-2.1.md b/UPGRADE-2.1.md
index 32ac226ff7e90..8187efef6d574 100644
--- a/UPGRADE-2.1.md
+++ b/UPGRADE-2.1.md
@@ -14,7 +14,7 @@
for multiple environments.
* The priorities for the built-in listeners have changed.
-
+
```
2.0 2.1
security.firewall kernel.request 64 8
@@ -204,7 +204,9 @@
* The Firewall listener is now registered after the Router listener. This
means that specific Firewall URLs (like /login_check and /logout) must now
- have proper routes defined in your routing configuration.
+ have proper routes defined in your routing configuration. Also, if you have
+ a custom 404 error page, make sure that you do not use any security related
+ features such as `is_granted` on it.
* The user provider configuration has been refactored. The configuration
for the chain provider and the memory provider has been changed:
@@ -248,9 +250,9 @@
use Symfony\Bundle\SecurityBundle\Validator\Constraint\UserPassword;
use Symfony\Bundle\SecurityBundle\Validator\Constraint as SecurityAssert;
```
-
+
After:
-
+
```
use Symfony\Component\Security\Core\Validator\Constraint\UserPassword;
use Symfony\Component\Security\Core\Validator\Constraint as SecurityAssert;
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