diff --git a/cmd/prometheus/Readme.md b/cmd/prometheus/Readme.md
index a0df1e196..6388a979c 100644
--- a/cmd/prometheus/Readme.md
+++ b/cmd/prometheus/Readme.md
@@ -5,11 +5,25 @@ Go to: [localhost:3000](localhost:3000), admin/admin
 List of hosts and ports to collecting metrics is in: `./cmd/prometheus/prometheus.yml`
 
 Env variables:
-- `XDG_DATA_HOME` re-defines default prometheus and grafana databases folder. 
+
+- `XDG_DATA_HOME` re-defines default prometheus and grafana databases folder.
 - `TG_PROMETHEUS_CONFIG` path to custom `prometheus.yml` file. Default is: `./cmd/prometheus/prometheus.yml`
 - `TG_GRAFANA_CONFIG` path to custom `grafana.ini file`. Default is: `./cmd/prometheus/grafana.ini`
 
 To add custom TG host: copy `./cmd/prometheus/prometheus.yml`, modify, pass new location by:
 `TG_PROMETHEUS_CONFIG=/new/location/prometheus.yml docker-compose up prometheus grafana`
 
+## For developers
 
+#### How to update dashboards
+
+1. Edit dashboard right in Grafana UI as you need. Save.
+2. Go to "Dashboard Settings" -> "JSON Model" -> Copy json representation of dashboard.
+3. Go to file `./cmd/prometheus/dashboards/turbo_geth.json` and past json there.
+4. Commit and push. Done. 
+
+#### How to add new metrics
+
+See example: `ethdb/object_db.go:dbGetTimer`
+
+For gRPC metrics search in code: `grpc_prometheus.Register`