diff --git a/plugins/router/bbox b/plugins/router/bbox
index 523ced40..8f2ee9f7 100644
--- a/plugins/router/bbox
+++ b/plugins/router/bbox
@@ -1,5 +1,5 @@
 #! /bin/sh
-# Parse bbox information
+# Parse bbox information - https://fr.wikipedia.org/wiki/Bbox
 # (c) 2018 - GPLv2 - Steve Schnepp <steve.schnepp@pwkf.org>
 #
 # Configuration is done via ENV vars, here is the default :