diff --git a/config/config.go b/config/config.go
index b0a564e..21ddfde 100644
--- a/config/config.go
+++ b/config/config.go
@@ -82,9 +82,6 @@ func WriteFile(filename string, content []byte) error {
 }
 
 func (mm MetricsConfig) validate() error {
-	if len(mm.Metrics) == 0 {
-		return errors.New("missing field 'metrics' in top configuration")
-	}
 	for i, m := range mm.Metrics {
 		if m.Name == "" {
 			return errors.New("missing field 'name' in 'metrics' configuration of metric " + fmt.Sprint(i))
diff --git a/examples/opcua.yaml b/examples/opcua.yaml
new file mode 100644
index 0000000..172ad4c
--- /dev/null
+++ b/examples/opcua.yaml
@@ -0,0 +1,13 @@
+metrics:
+  - name: Temperature   # MANDATORY
+    help: get metrics for machine temperature # MANDATORY
+    nodeid: ns=2;i=10853 # MANDATORY and UNIQUE for each metric
+    labels: # if metrics share the same name they can be distinguis by labels
+      site: MLK
+    type: gauge # MANDATORY metric type can be counter, gauge, Float, Double
+  - name: Temperature
+    help: get metrics for machine temperature
+    nodeid: ns=2;i=10852
+    labels:
+      site: Paris
+    type: gauge
diff --git a/opcua.yaml b/opcua.yaml
index 364bc0a..2490f8f 100644
--- a/opcua.yaml
+++ b/opcua.yaml
@@ -1,13 +1 @@
-metrics:
-  - name: Temperature   # MANDATORY
-    help: get metrics for machine temperature # MANDATORY
-    nodeid: ns=2;i=10853 # MANDATORY and UNIQUE for each metric
-    labels: # if metrics share the same name they can be distinguis by labels
-      site: MLK
-    type: gauge # MANDATORY metric type can be counter, gauge, Float, Double
-  - name: Temperature
-    help: get metrics for machine temperature
-    nodeid: ns=2;i=10852
-    labels: 
-      site: Paris
-    type: gauge
+metrics: []