diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index f2b956a8..cfc110b4 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -787,6 +787,7 @@ Ruby:
   - .rbx
   - .ru
   - .thor
+  - .watchr
   filenames:
   - Capfile
   - Rakefile