diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index aae547bd83..513061c68f 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -6920,6 +6920,7 @@ Starlark:
   extensions:
   - ".bzl"
   - ".star"
+  - ".tiltfile"
   filenames:
   - BUCK
   - BUILD