diff --git a/src/document.rs b/src/document.rs
index b43517c..b590bda 100644
--- a/src/document.rs
+++ b/src/document.rs
@@ -12,6 +12,7 @@ use jsonfeed;
 use jsonfeed::Item;
 use jsonfeed::Content;
 use serde_yaml;
+use itertools;
 
 #[cfg(all(feature="syntax-highlight", not(windows)))]
 use syntax_highlight::{initialize_codeblock, decorate_markdown};
@@ -98,6 +99,9 @@ fn permalink_attributes(front: &frontmatter::Frontmatter,
 
     attributes.insert(":slug".to_owned(), front.slug.clone());
 
+    attributes.insert(":categories".to_owned(),
+                      itertools::join(front.categories.iter(), "/"));
+
     attributes.insert(":output_ext".to_owned(), ".html".to_owned());
 
     if let Some(ref date) = front.published_date {