diff --git a/pkg/scheduler/factory/factory.go b/pkg/scheduler/factory/factory.go
index 0c7dee77134..fb5cc22fcbe 100644
--- a/pkg/scheduler/factory/factory.go
+++ b/pkg/scheduler/factory/factory.go
@@ -634,6 +634,9 @@ func (c *configFactory) updatePodInCache(oldObj, newObj interface{}) {
 		return
 	}
 
+	// NOTE: Because the scheduler uses snapshots of schedulerCache and the live
+	// version of equivalencePodCache, updates must be written to schedulerCache
+	// before invalidating equivalencePodCache.
 	if err := c.schedulerCache.UpdatePod(oldPod, newPod); err != nil {
 		glog.Errorf("scheduler cache UpdatePod failed: %v", err)
 	}
@@ -720,6 +723,9 @@ func (c *configFactory) deletePodFromCache(obj interface{}) {
 		glog.Errorf("cannot convert to *v1.Pod: %v", t)
 		return
 	}
+	// NOTE: Because the scheduler uses snapshots of schedulerCache and the live
+	// version of equivalencePodCache, updates must be written to schedulerCache
+	// before invalidating equivalencePodCache.
 	if err := c.schedulerCache.RemovePod(pod); err != nil {
 		glog.Errorf("scheduler cache RemovePod failed: %v", err)
 	}
@@ -776,6 +782,9 @@ func (c *configFactory) updateNodeInCache(oldObj, newObj interface{}) {
 		return
 	}
 
+	// NOTE: Because the scheduler uses snapshots of schedulerCache and the live
+	// version of equivalencePodCache, updates must be written to schedulerCache
+	// before invalidating equivalencePodCache.
 	if err := c.schedulerCache.UpdateNode(oldNode, newNode); err != nil {
 		glog.Errorf("scheduler cache UpdateNode failed: %v", err)
 	}
@@ -869,6 +878,9 @@ func (c *configFactory) deleteNodeFromCache(obj interface{}) {
 		glog.Errorf("cannot convert to *v1.Node: %v", t)
 		return
 	}
+	// NOTE: Because the scheduler uses snapshots of schedulerCache and the live
+	// version of equivalencePodCache, updates must be written to schedulerCache
+	// before invalidating equivalencePodCache.
 	if err := c.schedulerCache.RemoveNode(node); err != nil {
 		glog.Errorf("scheduler cache RemoveNode failed: %v", err)
 	}
@@ -1297,6 +1309,9 @@ func (c *configFactory) MakeDefaultErrorFunc(backoff *util.PodBackoff, podQueue
 					_, err := c.client.CoreV1().Nodes().Get(nodeName, metav1.GetOptions{})
 					if err != nil && errors.IsNotFound(err) {
 						node := v1.Node{ObjectMeta: metav1.ObjectMeta{Name: nodeName}}
+						// NOTE: Because the scheduler uses snapshots of schedulerCache and the live
+						// version of equivalencePodCache, updates must be written to schedulerCache
+						// before invalidating equivalencePodCache.
 						c.schedulerCache.RemoveNode(&node)
 						// invalidate cached predicate for the node
 						if c.enableEquivalenceClassCache {
diff --git a/pkg/scheduler/scheduler.go b/pkg/scheduler/scheduler.go
index a3109599911..98beabe5c57 100644
--- a/pkg/scheduler/scheduler.go
+++ b/pkg/scheduler/scheduler.go
@@ -373,6 +373,9 @@ func (sched *Scheduler) assume(assumed *v1.Pod, host string) error {
 	// If the binding fails, scheduler will release resources allocated to assumed pod
 	// immediately.
 	assumed.Spec.NodeName = host
+	// NOTE: Because the scheduler uses snapshots of SchedulerCache and the live
+	// version of Ecache, updates must be written to SchedulerCache before
+	// invalidating Ecache.
 	if err := sched.config.SchedulerCache.AssumePod(assumed); err != nil {
 		glog.Errorf("scheduler cache AssumePod failed: %v", err)