diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 1de4e25b..91662f0d 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -825,6 +825,8 @@ Puppet:
   lexer: Text only
   extensions:
   - .pp
+  filenames:
+  - Modulefile
 
 Pure Data:
   type: programming