diff --git a/lib/Db/SQLite3/AbstractPDODriver.php b/lib/Db/SQLite3/AbstractPDODriver.php
index a743a25..bc7ea61 100644
--- a/lib/Db/SQLite3/AbstractPDODriver.php
+++ b/lib/Db/SQLite3/AbstractPDODriver.php
@@ -7,5 +7,7 @@ declare(strict_types=1);
 namespace JKingWeb\Arsse\Db\SQLite3;
 
 abstract class AbstractPDODriver extends Driver {
+    // this class exists solely so SQLite's PDO driver can call methods of the generic PDO driver via parent::method()
+    // if there's a better way to do this, please FIXME ;)
     use \JKingWeb\Arsse\Db\PDODriver;
 }