diff --git a/include/sanity_check.php b/include/sanity_check.php
index 8d5f52377..ee3a0b006 100644
--- a/include/sanity_check.php
+++ b/include/sanity_check.php
@@ -1,4 +1,7 @@
 <?php
+	// WARNING: Don't ask for help on tt-rss.org forums or the bugtracker if you have
+	// modified this file.
+
 	function initial_sanity_check($link) {
 
 		$errors = array();