diff --git a/pkg/scheduler/framework/plugins/helper/normalize_score.go b/pkg/scheduler/framework/plugins/helper/normalize_score.go
index 2c7c951c851..3d35ca30493 100644
--- a/pkg/scheduler/framework/plugins/helper/normalize_score.go
+++ b/pkg/scheduler/framework/plugins/helper/normalize_score.go
@@ -21,8 +21,9 @@ import (
 )
 
 // DefaultNormalizeScore generates a Normalize Score function that can normalize the
-// scores to [0, maxPriority]. If reverse is set to true, it reverses the scores by
-// subtracting it from maxPriority.
+// scores from [0, max(scores)] to [0, maxPriority]. If reverse is set to true, it
+// reverses the scores by subtracting it from maxPriority.
+// Note: The input scores are always assumed to be non-negative integers.
 func DefaultNormalizeScore(maxPriority int64, reverse bool, scores framework.NodeScoreList) *framework.Status {
 	var maxCount int64
 	for i := range scores {
diff --git a/pkg/scheduler/framework/plugins/helper/normalize_score_test.go b/pkg/scheduler/framework/plugins/helper/normalize_score_test.go
index 50680a65159..e3d10a3a401 100644
--- a/pkg/scheduler/framework/plugins/helper/normalize_score_test.go
+++ b/pkg/scheduler/framework/plugins/helper/normalize_score_test.go
@@ -61,6 +61,15 @@ func TestDefaultNormalizeScore(t *testing.T) {
 			scores:         []int64{0, 1, 1, 1},
 			expectedScores: []int64{100, 0, 0, 0},
 		},
+		{
+			scores:         []int64{0, 0, 0, 0},
+			expectedScores: []int64{0, 0, 0, 0},
+		},
+		{
+			reverse:        true,
+			scores:         []int64{0, 0, 0, 0},
+			expectedScores: []int64{100, 100, 100, 100},
+		},
 	}
 
 	for i, test := range tests {