diff --git a/apps/mtm/serializers.py b/apps/mtm/serializers.py
index 7f191dee..f9be2640 100644
--- a/apps/mtm/serializers.py
+++ b/apps/mtm/serializers.py
@@ -17,7 +17,8 @@ class ShiftSerializer(CustomModelSerializer):
 class MaterialSimpleSerializer(CustomModelSerializer):
     class Meta:
         model = Material
-        fields = ['id', 'name', 'number', 'specification', 'type', 'cate']
+        fields = ['id', 'name', 'number',
+                  'specification', 'type', 'cate', 'brothers']
 
 
 class MaterialSerializer(CustomModelSerializer):