diff --git a/staging/src/k8s.io/api/events/v1/types.go b/staging/src/k8s.io/api/events/v1/types.go
index f11c2799803..4bf715872ab 100644
--- a/staging/src/k8s.io/api/events/v1/types.go
+++ b/staging/src/k8s.io/api/events/v1/types.go
@@ -25,6 +25,11 @@ import (
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 
 // Event is a report of an event somewhere in the cluster. It generally denotes some state change in the system.
+// Events have a limited retention time and triggers and messages may evolve
+// with time.  Event consumers should not rely on the timing of an event
+// with a given Reason reflecting a consistent underlying trigger, or the
+// continued existence of events with that Reason.  Events should be
+// treated as informative, best-effort, supplemental data.
 type Event struct {
 	metav1.TypeMeta `json:",inline"`
 
diff --git a/staging/src/k8s.io/api/events/v1beta1/types.go b/staging/src/k8s.io/api/events/v1beta1/types.go
index dce4e21dfd0..796e56ea7da 100644
--- a/staging/src/k8s.io/api/events/v1beta1/types.go
+++ b/staging/src/k8s.io/api/events/v1beta1/types.go
@@ -27,6 +27,11 @@ import (
 // +k8s:prerelease-lifecycle-gen:deprecated=1.22
 
 // Event is a report of an event somewhere in the cluster. It generally denotes some state change in the system.
+// Events have a limited retention time and triggers and messages may evolve
+// with time.  Event consumers should not rely on the timing of an event
+// with a given Reason reflecting a consistent underlying trigger, or the
+// continued existence of events with that Reason.  Events should be
+// treated as informative, best-effort, supplemental data.
 type Event struct {
 	metav1.TypeMeta `json:",inline"`