diff --git a/src/markup/syntax/highlighter/PhutilPygmentsSyntaxHighlighter.php b/src/markup/syntax/highlighter/PhutilPygmentsSyntaxHighlighter.php
--- a/src/markup/syntax/highlighter/PhutilPygmentsSyntaxHighlighter.php
+++ b/src/markup/syntax/highlighter/PhutilPygmentsSyntaxHighlighter.php
@@ -164,6 +164,7 @@
       'pl' => 'prolog',
       'pro' => 'prolog',
       'proto' => 'protobuf',
+      'pp' => 'puppet',
       'py' => 'python',
       'pyw' => 'python',
       'sc' => 'python',