diff --git a/core/modules/search/lib/Drupal/search/SearchQuery.php b/core/modules/search/lib/Drupal/search/SearchQuery.php
index 668ca14..8e5f803 100644
--- a/core/modules/search/lib/Drupal/search/SearchQuery.php
+++ b/core/modules/search/lib/Drupal/search/SearchQuery.php
@@ -443,7 +443,8 @@ public function execute()
 
     // Format the float to make sure that the decimal separator is a period
     // no matter what the numeric locale is set to. This is so the database
-    // query will not fail.
+    // query will not fail because a float with a comma is handed to MySQL as a
+    // number to do calculations on.
     $relevance = number_format((1.0 / $this->normalize), 10, '.', '');
     // Replace i.relevance pseudo-field with the actual, normalized value.
     $this->scores = str_replace('i.relevance', '(' . $relevance . ' * i.score * t.count)', $this->scores);