diff --git a/compose.yml b/compose.yml
index 6d00b4e..196d4e4 100644
--- a/compose.yml
+++ b/compose.yml
@@ -1,4 +1,6 @@
 
+# https://hub.docker.com/repository/docker/rardcode/bind9/tags
+
 services:
   bind9:
     image: rardcode/bind9