diff --git a/pillar.example b/pillar.example
index ee277dc..b421fc1 100644
--- a/pillar.example
+++ b/pillar.example
@@ -197,6 +197,10 @@ prometheus:
           source: https://github.com/wrouesnel/postgres_exporter/releases/download/v0.8.0/postgres_exporter_v0.8.0_linux-amd64.tar.gz
           skip_verify: true
 
+      mysqld_exporter:
+        service:
+          env:
+            - 'DATA_SOURCE_NAME=foo:bar@/'
   linux:
     # 'Alternatives system' priority: zero disables (default)
     # yamllint disable-line rule:braces