diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index b036a9eb..ef3f103e 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1058,6 +1058,8 @@ XML:
   - .wxl
   - .wxs
   - .xaml
+  - .xlf
+  - .xliff
   - .xml
   - .xsd
   - .xsl