Installing-using-Docker-(recommended!).md

@@ -171,6 +171,9 @@ FreeDMR `[DATA-GATEWAY]` relationship and writes one matching gateway
 relationship for each HDStack worker. No manual JSON editing is required when
 the guided installer is used.
 
+See [FreeDMR Data Gateway](FreeDMR-Data-Gateway) for the service overview,
+operation, logging and troubleshooting guidance.
+
 The standard repository `docker-compose.yml` is an installer template. Do not
 start its `data-gateway` service while values such as
 `__FREEDMR_GATEWAY_FBP_RELATIONSHIPS__` remain in the file. The gateway will