diff --git a/config.php-dist b/config.php-dist
index 463661f48..9066ef054 100644
--- a/config.php-dist
+++ b/config.php-dist
@@ -14,6 +14,8 @@
 	
 	define('WEB_DEMO_MODE', false);
 	// Demo mode with reduced functionality.
+	// Warning: this option is obsolete. Don't rely on it being
+	// checked in all necessary places.
 
 	define('ICONS_DIR', "icons");
 	define('ICONS_URL', "icons");