diff --git a/UPGRADE-5.1.md b/UPGRADE-5.1.md
index 3143e173bd05e..bc5a5e508391f 100644
--- a/UPGRADE-5.1.md
+++ b/UPGRADE-5.1.md
@@ -101,6 +101,7 @@ Notifier
    arguments were removed.
  * [BC BREAK] The `EmailMessage::fromNotification()` and `SmsMessage::fromNotification()`
    methods' `$transport` argument was removed.
+ * Deprecate `SlackOptions::channel()`, use `SlackOptions::recipient()` instead.
 
 OptionsResolver
 ---------------
diff --git a/UPGRADE-5.2.md b/UPGRADE-5.2.md
index c49e55445e34d..3334ed6665f2c 100644
--- a/UPGRADE-5.2.md
+++ b/UPGRADE-5.2.md
@@ -173,4 +173,3 @@ Security
  * Deprecated the `AbstractRememberMeServices::$providerKey` property in favor of
    `AbstractRememberMeServices::$firewallName`, the old property will be removed
    in 6.0.
-
diff --git a/UPGRADE-6.0.md b/UPGRADE-6.0.md
index b0e52953dd672..87fe763d6e3cf 100644
--- a/UPGRADE-6.0.md
+++ b/UPGRADE-6.0.md
@@ -113,6 +113,11 @@ Monolog
  * The `$actionLevel` constructor argument of `Symfony\Bridge\Monolog\Handler\FingersCrossed\NotFoundActivationStrategy` has been replaced by the `$inner` one which expects an ActivationStrategyInterface to decorate instead. `Symfony\Bridge\Monolog\Handler\FingersCrossed\NotFoundActivationStrategy` is now final.
  * The `$actionLevel` constructor argument of `Symfony\Bridge\Monolog\Handler\FingersCrossed\HttpCodeActivationStrategy` has been replaced by the `$inner` one which expects an ActivationStrategyInterface to decorate instead. `Symfony\Bridge\Monolog\Handler\FingersCrossed\HttpCodeActivationStrategy` is now final.
 
+Notifier
+--------
+
+ * Remove `SlackOptions::channel()`, use `SlackOptions::recipient()` instead.
+
 OptionsResolver
 ---------------