diff --git a/system/Filters/PageCache.php b/system/Filters/PageCache.php
index 664ef5c7db6a..d6fa407f5a0d 100644
--- a/system/Filters/PageCache.php
+++ b/system/Filters/PageCache.php
@@ -36,6 +36,8 @@ public function __construct()
      * Checks page cache and return if found.
      *
      * @param array|null $arguments
+     *
+     * @return ResponseInterface|void
      */
     public function before(RequestInterface $request, $arguments = null)
     {