diff --git a/core/systemcontracts/upgrade.go b/core/systemcontracts/upgrade.go
index 5dabf898f2..9951817452 100644
--- a/core/systemcontracts/upgrade.go
+++ b/core/systemcontracts/upgrade.go
@@ -483,6 +483,7 @@ func init() {
 		},
 	}
 
+	// TODO: update the commit url of bohr upgrade
 	bohrUpgrade[mainNet] = &Upgrade{
 		UpgradeName: "bohr",
 		Configs: []*UpgradeConfig{