src/Plugin/views/cache/SearchApiCache.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Plugin/views/cache/SearchApiCache.php b/src/Plugin/views/cache/SearchApiCache.php
index a9af6fd..9308676 100644
--- a/src/Plugin/views/cache/SearchApiCache.php
+++ b/src/Plugin/views/cache/SearchApiCache.php
@@ -92,6 +92,10 @@ class SearchApiCache extends Time {
 
   /**
    * {@inheritdoc}
+   *
+   * @todo This is completely wrong. This is inherited from the Drupal 7 port,
+   *       or from old Drupal 8 Views code. Look at the parent's implementation
+   *       (i.e. in Drupal 8 core).
    */
   public function generateResultsKey() {
     if (!isset($this->resultsKey)) {