From c2dabfbe2dec5f8274202159d370deba4ed20835 Mon Sep 17 00:00:00 2001
From: Alex Cabal <alex@alexcabal.com>
Date: Wed, 27 Jul 2022 11:30:56 -0500
Subject: [PATCH] Add comment for clarity

---
 lib/Ebook.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Ebook.php b/lib/Ebook.php
index f392b45f..0758cea3 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -405,6 +405,7 @@ class Ebook{
 				$this->Sources[] = new EbookSource(SOURCE_PROJECT_GUTENBERG_CANADA, $e);
 			}
 			elseif(mb_stripos($e, 'archive.org/details') !== false){
+				// `/details` excludes Wayback Machine URLs which may sometimes occur, for example in Lyrical Ballads
 				$this->Sources[] = new EbookSource(SOURCE_INTERNET_ARCHIVE, $e);
 			}
 			elseif(mb_stripos($e, 'hathitrust.org/') !== false){