diff --git a/src/Executor/Executor.php b/src/Executor/Executor.php
index bf07cdd..30ccad4 100644
--- a/src/Executor/Executor.php
+++ b/src/Executor/Executor.php
@@ -74,7 +74,7 @@ class Executor
      * execution are collected in `$result->errors`.
      *
      * @param mixed|null               $rootValue
-     * @param mixed[]|null             $contextValue
+     * @param mixed|null               $contextValue
      * @param mixed[]|ArrayAccess|null $variableValues
      * @param string|null              $operationName
      *
@@ -119,8 +119,8 @@ class Executor
      *
      * Useful for async PHP platforms.
      *
-     * @param mixed[]|null $rootValue
-     * @param mixed[]|null $contextValue
+     * @param mixed|null   $rootValue
+     * @param mixed|null   $contextValue
      * @param mixed[]|null $variableValues
      * @param string|null  $operationName
      *
@@ -161,9 +161,9 @@ class Executor
      * and returns it as the result, or if it's a function, returns the result
      * of calling that function while passing along args and context.
      *
-     * @param mixed        $source
-     * @param mixed[]      $args
-     * @param mixed[]|null $context
+     * @param mixed      $source
+     * @param mixed[]    $args
+     * @param mixed|null $context
      *
      * @return mixed|null
      */
diff --git a/src/Executor/ReferenceExecutor.php b/src/Executor/ReferenceExecutor.php
index 5944a6e..90030de 100644
--- a/src/Executor/ReferenceExecutor.php
+++ b/src/Executor/ReferenceExecutor.php
@@ -115,8 +115,8 @@ class ReferenceExecutor implements ExecutorImplementation
      * Constructs an ExecutionContext object from the arguments passed to
      * execute, which we will pass throughout the other execution methods.
      *
-     * @param mixed[]             $rootValue
-     * @param mixed[]             $contextValue
+     * @param mixed               $rootValue
+     * @param mixed               $contextValue
      * @param mixed[]|Traversable $rawVariableValues
      * @param string|null         $operationName
      *