diff --git a/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php b/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
index f92a5563..f98ecfac 100644
--- a/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
+++ b/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
@@ -35,14 +35,21 @@ use Monolog\Logger;
  */
 class ChannelLevelActivationStrategy implements ActivationStrategyInterface
 {
+    /**
+     * @var int
+     */
     private $defaultActionLevel;
+
+    /**
+     * @var array
+     */
     private $channelToActionLevel;
 
     /**
      * @param int|string $defaultActionLevel   The default action level to be used if the record's category doesn't match any
      * @param array      $channelToActionLevel An array that maps channel names to action levels.
      */
-    public function __construct($defaultActionLevel, $channelToActionLevel = [])
+    public function __construct($defaultActionLevel, array $channelToActionLevel = [])
     {
         $this->defaultActionLevel = Logger::toMonologLevel($defaultActionLevel);
         $this->channelToActionLevel = array_map('Monolog\Logger::toMonologLevel', $channelToActionLevel);
diff --git a/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php b/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
index 447aa053..71601e40 100644
--- a/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
+++ b/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
@@ -20,6 +20,9 @@ use Monolog\Logger;
  */
 class ErrorLevelActivationStrategy implements ActivationStrategyInterface
 {
+    /**
+     * @var int
+     */
     private $actionLevel;
 
     /**
diff --git a/src/Monolog/Handler/Slack/SlackRecord.php b/src/Monolog/Handler/Slack/SlackRecord.php
index 0fbd4ab7..36f43734 100755
--- a/src/Monolog/Handler/Slack/SlackRecord.php
+++ b/src/Monolog/Handler/Slack/SlackRecord.php
@@ -47,7 +47,7 @@ class SlackRecord
 
     /**
      * User icon e.g. 'ghost', 'http://example.com/user.png'
-     * @var ?string
+     * @var string|null
      */
     private $userIcon;