--- a/pkg/models/isrs.go	Sat Aug 06 00:46:21 2022 +0200
+++ b/pkg/models/isrs.go	Sat Aug 06 02:09:57 2022 +0200
@@ -30,6 +30,7 @@
 	Hectometre     int
 }
 
+// UnmarshalJSON implements the json.Unmarshaler interface.
 func (isrs *Isrs) UnmarshalJSON(data []byte) error {
 	var s string
 	if err := json.Unmarshal(data, &s); err != nil {
@@ -43,6 +44,7 @@
 	return nil
 }
 
+// Less orders two Isrs codes.
 func (isrs *Isrs) Less(other *Isrs) bool {
 	if isrs.CountryCode < other.CountryCode {
 		return true
@@ -74,6 +76,7 @@
 	return false
 }
 
+// MarshalJSON implements the json.Marshaler interface.
 func (isrs *Isrs) MarshalJSON() ([]byte, error) {
 	if isrs == nil {
 		return nil, nil