diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 8da5cf77..26a8fbd5 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -2212,6 +2212,7 @@ XML:
   - .clixml
   - .cproject
   - .csproj
+  - .ct
   - .dita
   - .ditamap
   - .ditaval