diff --git a/operator/v1/types_klusterlet.go b/operator/v1/types_klusterlet.go
index 0e0d891cf..31014edca 100644
--- a/operator/v1/types_klusterlet.go
+++ b/operator/v1/types_klusterlet.go
@@ -95,7 +95,9 @@ type KlusterletSpec struct {
 type ResourceQosClass string
 
 const (
-	ResourceQosClassDefault    ResourceQosClass = "Default"
+	// Default use resource setting in the template file
+	ResourceQosClassDefault ResourceQosClass = "Default"
+	// If all containers in the pod don't set resource request and limits, the pod is treated as BestEffort.
 	ResourceQosClassBestEffort ResourceQosClass = "BestEffort"
 )