diff --git a/src/Redis.php b/src/Redis.php
index b60dc8e..4561e23 100644
--- a/src/Redis.php
+++ b/src/Redis.php
@@ -3388,10 +3388,10 @@ public function zUnionStore($output, $zSetKeys, array $weights = null, $aggregat
      * @see zUnionStore
      * @deprecated use Redis::zUnionStore()
      *
-     * @param $Output
-     * @param $ZSetKeys
+     * @param string     $Output
+     * @param array      $ZSetKeys
      * @param array|null $Weights
-     * @param string $aggregateFunction
+     * @param string     $aggregateFunction
      */
     public function zUnion($Output, $ZSetKeys, array $Weights = null, $aggregateFunction = 'SUM')
     {