diff --git a/main/confloader/confloader.go b/main/confloader/confloader.go
index f987ddc76..d52b5b89e 100644
--- a/main/confloader/confloader.go
+++ b/main/confloader/confloader.go
@@ -13,6 +13,8 @@ var (
 	EffectiveExtConfigLoader  extconfigLoader
 )
 
+// LoadConfig reads from a path/url/stdin
+// actual work is in external module
 func LoadConfig(file string) (io.Reader, error) {
 	if EffectiveConfigFileLoader == nil {
 		newError("external config module not loaded, reading from stdin").AtInfo().WriteToLog()
@@ -21,6 +23,8 @@ func LoadConfig(file string) (io.Reader, error) {
 	return EffectiveConfigFileLoader(file)
 }
 
+// LoadExtConfig calls v2ctl to handle multiple config
+// the actual work also in external module
 func LoadExtConfig(files []string) (io.Reader, error) {
 	if EffectiveExtConfigLoader == nil {
 		return nil, newError("external config module not loaded").AtError()