diff --git a/core/lib/Drupal/Component/Utility/Random.php b/core/lib/Drupal/Component/Utility/Random.php
index 1f0e9a2fab6..57287f9d5fe 100644
--- a/core/lib/Drupal/Component/Utility/Random.php
+++ b/core/lib/Drupal/Component/Utility/Random.php
@@ -264,8 +264,10 @@ class Random {
    *
    * @param string $destination
    *   The absolute file path where the image should be stored.
-   * @param int $min_resolution
-   * @param int $max_resolution
+   * @param string $min_resolution
+   *   The minimum resolution for the image. For example, '400x300'.
+   * @param string $max_resolution
+   *   The maximum resolution for the image. For example, '800x600'.
    *
    * @return string
    *   Path to image file.