diff --git a/tools/events/interfaces.go b/tools/events/interfaces.go
index 56c678aa..2e6e2eae 100644
--- a/tools/events/interfaces.go
+++ b/tools/events/interfaces.go
@@ -33,6 +33,9 @@ type EventRecorder interface {
 	// should be in UpperCamelCase format (starting with a capital letter). "reason" will be used
 	// to automate handling of events, so imagine people writing switch statements to handle them.
 	// You want to make that easy.
+	// 'action' explains what happened with regarding/what action did the ReportingController
+	// (ReportingController is a type of a Controller reporting an Event, e.g. k8s.io/node-controller, k8s.io/kubelet.)
+	// take in regarding's name; it should be in UpperCamelCase format (starting with a capital letter).
 	// 'note' is intended to be human readable.
 	Eventf(regarding runtime.Object, related runtime.Object, eventtype, reason, action, note string, args ...interface{})
 }