diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 8342948b..eef8bdb9 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -937,6 +937,7 @@ TeX:
   - .tex
   - .toc
   - .dtx
+  - .ins
 
 Text:
   type: data