diff --git a/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php b/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php
index f5f8c0bb6..978e75a43 100644
--- a/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php
+++ b/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php
@@ -44,6 +44,7 @@ public function getDelimiterUse(DelimiterInterface $opener, DelimiterInterface $
             return 0;
         }
 
+        // $opener and $closer are the same length so we just return one of them
         return $opener->getLength();
     }