diff --git a/common/platform/platform.go b/common/platform/platform.go
index 6ccd9762..b57a98fd 100644
--- a/common/platform/platform.go
+++ b/common/platform/platform.go
@@ -84,6 +84,7 @@ func GetConfigurationPath() string {
 	return filepath.Join(configPath, "config.json")
 }
 
+// GetConfDirPath reads "v2ray.location.confdir"
 func GetConfDirPath() string {
 	const name = "v2ray.location.confdir"
 	configPath := NewEnvFlag(name).GetValue(func() string { return "" })