updated documentation for pi-hole

docs/customservices.md

@@ -63,9 +63,18 @@ The following configuration is available for the PiHole service.
  # subtitle: "Network-wide Ad Blocking" # optional, if no subtitle is defined, PiHole statistics will be shown
  url: "http://192.168.0.151/admin"
  apikey: "<---insert-api-key-here--->" # optional, needed if web interface is password protected
+ items: ["ads_percentage_today"] # optional, which items to show (and in which order) in the subtitle. Possible values are all fields of the status api (see below)
+ format: "{0} % blocked" # the format of the subtitle, required only if items are given
  type: "PiHole"
 ```
 
+**Items:**
+The fields of the status api are outlined [here](https://docs.pi-hole.net/ftldns/telnet-api/?h=api#stats). Another example of `items` and `format`:
+```yaml
+items: ["queries_forwarded", "dns_queries_today"]
+format: "{0} of {1} queries forwarded"
+```
+
 **Remarks:**
 If PiHole web interface is password protected, obtain the `apikey` from Settings > API/Web interface > Show API token.