diff --git a/data/apps/common/comm.cfg b/data/apps/common/comm.cfg
index 4af186b..66b1749 100644
--- a/data/apps/common/comm.cfg
+++ b/data/apps/common/comm.cfg
@@ -30,7 +30,7 @@
                 , "ping_timeout_secs": 2.0
                 , "verbose": false
             }
-            , "tester-01": {
+            , "tester-01": { # to use docker compose service from outside
                 "url": "redis://cvtt-tester-01.cvtt.vpn:16379"
                 , "type": "redis"
                 , "read_timeout" : 0.01