diff --git a/defaults/main.yml b/defaults/main.yml
index 2a63f0c..217ccd8 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -35,9 +35,12 @@ docker_daemon_debug: False
 docker_prometheus_metrics: True
 docker_prometheus_host: 127.0.0.1
 
-# merge, replace
+# Usage:
+# node.labels.<key_name>==<label_value>
+# node.labels.<key_name>!=<label_value>
+#
+# state modes: merge, replace
 docker_label_state_mode: merge
 docker_node_labels: []
-#docker_node_labels:
 #  - { key: 'key_name', value: 'label_value' }