diff --git a/config/cros.go b/config/cros.go
index 6c40411..083e086 100644
--- a/config/cros.go
+++ b/config/cros.go
@@ -1,5 +1,6 @@
 package config
 
+// CROSConf stores the configuration for cross domain
 type CROSConf struct {
 	Address string `json:",env=CROS_ADDRESS"`
 }