diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 1a983d49..c12becd6 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1226,6 +1226,9 @@ XML:
   primary_extension: .xml
   extensions:
   - .ccxml
+  - .dita
+  - .ditamap
+  - .ditaval
   - .glade
   - .grxml
   - .kml