diff --git a/src/Templating/LazyFilterRuntime.php b/src/Templating/LazyFilterRuntime.php
index 19439d44..91e5ccf2 100644
--- a/src/Templating/LazyFilterRuntime.php
+++ b/src/Templating/LazyFilterRuntime.php
@@ -25,12 +25,12 @@ final class LazyFilterRuntime implements RuntimeExtensionInterface
     private ?string $assetVersion;
 
     /**
-     * @var array|null
+     * @var array<string, string>|null
      */
     private $jsonManifest;
 
     /**
-     * @var array|null
+     * @var array<string, string>|null
      */
     private $jsonManifestLookup;