diff --git a/lib/styleguide.js b/lib/styleguide.js
index <HASH>..<HASH> 100644
--- a/lib/styleguide.js
+++ b/lib/styleguide.js
@@ -244,7 +244,7 @@ function jsonSections(sections) {
       experimental: section.experimental(),
       reference: section.reference(),
       markup: section.markup() ? section.markup().toString() : null
-    }
+    } 
   });
 }
Preserve undefined and false markup() results