diff --git a/src/docs/user/configuration/configuring_preamble.diviner b/src/docs/user/configuration/configuring_preamble.diviner
--- a/src/docs/user/configuration/configuring_preamble.diviner
+++ b/src/docs/user/configuration/configuring_preamble.diviner
@@ -82,7 +82,7 @@
 
   $real_address = your_custom_parsing_function($raw_header);
 
-  $_SERVER['REMOTE_ADDR'] = $raw_header;
+  $_SERVER['REMOTE_ADDR'] = $real_address;
 }
 ```