diff --git a/pkg/scheduler/framework/interface.go b/pkg/scheduler/framework/interface.go
index f5dd413c3ca..864932e830a 100644
--- a/pkg/scheduler/framework/interface.go
+++ b/pkg/scheduler/framework/interface.go
@@ -307,10 +307,13 @@ type QueueSortPlugin interface {
 }
 
 // EnqueueExtensions is an optional interface that plugins can implement to efficiently
-// move unschedulable Pods in internal scheduling queues.
+// move unschedulable Pods in internal scheduling queues. Plugins
+// that fail pod scheduling (e.g., Filter plugins) are expected to implement this interface.
 type EnqueueExtensions interface {
-	// EventsToRegister returns a series of interested events that
-	// will be registered when instantiating the internal scheduling queue.
+	// EventsToRegister returns a series of possible events that may cause a Pod
+	// failed by this plugin schedulable.
+	// The events will be registered when instantiating the internal scheduling queue,
+	// and leveraged to build event handlers dynamically.
 	// Note: the returned list needs to be static (not depend on configuration parameters);
 	// otherwise it would lead to undefined behavior.
 	EventsToRegister() []ClusterEvent