diff --git a/system/Router/AutoRouterImproved.php b/system/Router/AutoRouterImproved.php
index b8c1e9d35099..a186fd33ef55 100644
--- a/system/Router/AutoRouterImproved.php
+++ b/system/Router/AutoRouterImproved.php
@@ -46,6 +46,8 @@ final class AutoRouterImproved implements AutoRouterInterface
 
     /**
      * An array of params to the controller method.
+     *
+     * @phpstan-var list<string>
      */
     private array $params = [];
 
@@ -72,6 +74,8 @@ final class AutoRouterImproved implements AutoRouterInterface
 
     /**
      * The URI segments.
+     *
+     * @phpstan-var list<string>
      */
     private array $segments = [];
 
@@ -279,6 +283,7 @@ public function getRoute(string $uri, string $httpVerb): array
         }
 
         // The first item may be a method name.
+        /** @phpstan-var list<string> $params */
         $params = $this->params;
 
         $methodParam = array_shift($params);