diff --git a/inc/config.php b/inc/config.php
index 20eaf03d..3a406a44 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -367,6 +367,9 @@
     // If poster's proxy supplies X-Forwarded-For header, save it for further inspection and/or filtering.
     $config['proxy_save'] = false;
 
+    // Old not clearly documented anti-bot feature. Disabled by default.
+    $config['referer_match'] = false;
+
     /*
      * Custom filters detect certain posts and reject/ban accordingly. They are made up of a condition and an
      * action (for when ALL conditions are met). As every single post has to be put through each filter,