diff --git a/core/modules/views/src/Tests/TestHelperPlugin.php b/core/modules/views/src/Tests/TestHelperPlugin.php
index 6bd7a1b..330492e 100644
--- a/core/modules/views/src/Tests/TestHelperPlugin.php
+++ b/core/modules/views/src/Tests/TestHelperPlugin.php
@@ -49,6 +49,8 @@ public function setDefinedOptions($options) {
    * {@inheritdoc}
    */
   protected function defineOptions() {
+    // Normally we provide a limited set of options, but for testing purposes we
+    // make it possible to set the defined options statically.
     return $this->definedOptions;
   }