diff --git a/lib/codex/project.js b/lib/codex/project.js
index 7039655..293cd67 100644
--- a/lib/codex/project.js
+++ b/lib/codex/project.js
@@ -47,8 +47,11 @@ Project.prototype.parseMarkdown = function (text) {
     if (token.type == 'code') {
       var lang = token.lang || 'javascript';
       if (lang == 'js') lang = 'javascript';
-      token.text = highlight.highlight(lang, token.text).value;
-      token.escaped = true;
+      if (lang == 'html') lang = 'xml';
+      if (highlight.LANGUAGES.hasOwnProperty(lang)) {
+        token.text = highlight.highlight(lang, token.text).value;
+        token.escaped = true;
+      }
     }
   }
   text = marked.parser(tokens);