diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index a470f579..7976d658 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1231,6 +1231,11 @@ XS:
   extensions:
   - .xs
 
+Xtend:
+  type: programming
+  extensions:
+  - .xtend
+
 YAML:
   type: markup
   primary_extension: .yml