diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 32143b7e..17a23544 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1907,6 +1907,7 @@ Ruby:
   - Jarfile
   - Mavenfile
   - Podfile
+  - Puppetfile
   - Thorfile
   - Vagrantfile
   - buildfile