diff --git a/pkg/apis/core/types.go b/pkg/apis/core/types.go
index 96e9b0a5c6e..ec2fbc6fb4d 100644
--- a/pkg/apis/core/types.go
+++ b/pkg/apis/core/types.go
@@ -5683,7 +5683,6 @@ type Event struct {
 	metav1.ObjectMeta
 
 	// The object that this event is about. Mapped to events.Event.regarding
-	// +optional
 	InvolvedObject ObjectReference
 
 	// Optional; this should be a short, machine understandable string that gives the reason