diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 5996fc8c..b2b747be 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -2160,10 +2160,13 @@ TeX:
   extensions:
   - .tex
   - .aux
+  - .bbx
   - .bib
+  - .cbx
   - .cls
   - .dtx
   - .ins
+  - .lbx
   - .ltx
   - .mkii
   - .mkiv