diff --git a/pkg/driver/controller.go b/pkg/driver/controller.go
index 80e7c038a..154655641 100644
--- a/pkg/driver/controller.go
+++ b/pkg/driver/controller.go
@@ -58,6 +58,7 @@ const (
 	Mi = 1024 * 1024
 	Gi = 1024 * 1024 * 1024
 
+	// Ping event is sent periodically
 	Ping string = "zfs-ping"
 
 	// DefaultCASType Event application name constant for volume event