diff --git a/share/misc/iso639 b/share/misc/iso639
index 1902e51c21ba..1a7da216bfb6 100644
--- a/share/misc/iso639
+++ b/share/misc/iso639
@@ -127,6 +127,7 @@ cu	chu	chu	Church Slavic; Old Slavonic; Church Slavonic; Old Bulgarian; Old Chur
 cv	chv	chv	Chuvash
 	chy	chy	Cheyenne
 	cmc	cmc	Chamic languages
+	cnr	cnr	Montenegrin
 	cop	cop	Coptic
 kw	cor	cor	Cornish
 co	cos	cos	Corsican