diff --git a/src/Symfony/Configuration.php b/src/Symfony/Configuration.php
index 4c1f1a31..dabaa09f 100644
--- a/src/Symfony/Configuration.php
+++ b/src/Symfony/Configuration.php
@@ -2,14 +2,21 @@
 
 namespace PHPStan\Symfony;
 
+/**
+ * @phpstan-type ParametersArray array{
+ *     containerXmlPath?: string, container_xml_path?: string,
+ *     constantHassers?: bool, constant_hassers?: bool,
+ *     consoleApplicationLoader?: string, console_application_loader?: string,
+ * }
+ */
 final class Configuration
 {
 
-	/** @var array<string, mixed> */
+	/** @var ParametersArray */
 	private $parameters;
 
 	/**
-	 * @param array<string, mixed> $parameters
+	 * @phpstan-param ParametersArray $parameters
 	 */
 	public function __construct(array $parameters)
 	{
diff --git a/src/Type/Symfony/ParameterDynamicReturnTypeExtension.php b/src/Type/Symfony/ParameterDynamicReturnTypeExtension.php
index b160ddc8..28555e0f 100644
--- a/src/Type/Symfony/ParameterDynamicReturnTypeExtension.php
+++ b/src/Type/Symfony/ParameterDynamicReturnTypeExtension.php
@@ -159,6 +159,7 @@ private function generalizeTypeFromValue(Scope $scope, $value): Type
 			if ($hasOnlyStringKey) {
 				$keyTypes = [];
 				$valueTypes = [];
+				/** @var array<mixed>|bool|float|int|string $element */
 				foreach ($value as $key => $element) {
 					/** @var ConstantStringType $keyType */
 					$keyType = $scope->getTypeFromValue($key);
@@ -171,9 +172,11 @@ private function generalizeTypeFromValue(Scope $scope, $value): Type
 
 			return new ArrayType(
 				TypeCombinator::union(...array_map(function ($item) use ($scope): Type {
+					/** @var array<mixed>|bool|float|int|string $item */
 					return $this->generalizeTypeFromValue($scope, $item);
 				}, array_keys($value))),
 				TypeCombinator::union(...array_map(function ($item) use ($scope): Type {
+					/** @var array<mixed>|bool|float|int|string $item */
 					return $this->generalizeTypeFromValue($scope, $item);
 				}, array_values($value)))
 			);