diff --git a/index.html b/index.html
index ec1054d11886c8f41f2c4f5c3ee7d34128d5f003..3a052e2222a5bd54ebe755439a5774cb8377105b 100644
--- a/index.html
+++ b/index.html
@@ -73,6 +73,7 @@
   <script src="//unpkg.com/prismjs/components/prism-visual-basic.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-javascript.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-python.min.js"></script>
+  <script src="//unpkg.com/prismjs/components/prism-perl.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-ruby.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-php.min.js"></script>
   <script src="//unpkg.com/prismjs/components/prism-sql.min.js"></script>