diff --git a/data/langdb.yaml b/data/langdb.yaml
index 9fe88b4..a7936ba 100644
--- a/data/langdb.yaml
+++ b/data/langdb.yaml
@@ -79,6 +79,7 @@ languages:
   brh: [Latn, [ME, AS], Bráhuí]
   brx: [Deva, [AS], बड़ो]
   bs: [Latn, [EU], bosanski]
+  btm: [Latn, [AS], Mandailing]
   bto: [Latn, [AS], Iriga Bicolano]
   bug: [Bugi, [AS], ᨅᨔ ᨕᨘᨁᨗ]
   bxr: [Cyrl, [AS], буряад]
diff --git a/language-data.json b/language-data.json
index 6aa9ce7..e6b26e3 100644
--- a/language-data.json
+++ b/language-data.json
@@ -492,6 +492,13 @@
             ],
             "bosanski"
         ],
+        "btm": [
+            "Latn",
+            [
+                "AS"
+            ],
+            "Mandailing"
+        ],
         "bto": [
             "Latn",
             [