diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index e70bbea0..53db94d6 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -839,6 +839,7 @@ JavaScript:
   - .jsm
   - .jss
   - .jsx
+  - .njs
   - .pac
   - .sjs
   - .ssjs