diff --git a/collector.go b/collector.go
index d9b9a24..b809e86 100644
--- a/collector.go
+++ b/collector.go
@@ -194,7 +194,7 @@ var (
 
 	lanModeDesc = prometheus.NewDesc(
 		prometheus.BuildFQName(namespace, "config", "lan_mode"),
-		"Returns configured LAN mode.",
+		"Returns configured LAN mode (0=dedicated, 1=shared, 2=failover).",
 		nil,
 		nil,
 	)