diff --git a/pkg/compute/models/skus.go b/pkg/compute/models/skus.go
index 336ff82a49..89ae41ffa0 100644
--- a/pkg/compute/models/skus.go
+++ b/pkg/compute/models/skus.go
@@ -529,6 +529,7 @@ func providerFilter(q *sqlchemy.SQuery, provider string, public_cloud bool) *sql
 		iconditions := NetworkUsableZoneQueries(q.Field("zone_id"), true, true)
 		q = q.Filter(sqlchemy.OR(iconditions...))
 	} else {
+		// 私有云sku 只定义到region层级, zone id 为空.因此只能按region查询
 		iconditions := networkUsableRegionQueries(q.Field("cloudregion_id"))
 		q = q.Filter(sqlchemy.OR(iconditions...))
 	}