diff --git a/_includes/nav.html b/_includes/nav.html
index 0bcad3f850805997c5707555139f0f18bb1fbfef..cc6829a77adfbb21ea121057141c3ecff1cd0617 100644
--- a/_includes/nav.html
+++ b/_includes/nav.html
@@ -15,7 +15,6 @@
     </div>
 
 {% assign url_parts = page.url | split: '/' %}
-{% assign url_parts_size = url_parts | size %}
 {% assign base_url = url_parts | last %}
 {% assign sorted_pages = site.pages | sort:"menu_order" %}
 
diff --git a/projects/README.md b/projects/README.md
index 9676cf6207890deb650b0f47e7fc1f5512271fea..9f7bcbbae704b4dd78f22ed5b3daaf1475fce84c 100644
--- a/projects/README.md
+++ b/projects/README.md
@@ -12,6 +12,9 @@ Each post needs some specific parameters:
  link and just under the title in the post page
  * **start** (optional) the project start date
  * **end** (optional) the project end date
- * **redirect_from** (optional) not needed for new projects, this is just the redirect link from old activities pages on the former site
+ * **pillar** (optional) the pillar (in the sense of http://kwarc.info/research) of the
+   project. 
+ * **redirect_from** (optional) not needed for new projects, this is just the redirect
+   link from old activities pages on the former site. 
  * **funding** (optional): the funding body, *DFG*, *Leibniz Foundation*, *EU*, *Industry*
 
diff --git a/projects/arXMLiv.md b/projects/arXMLiv.md
index 86a4dc7b920105293127133dac9652f020070142..9d333d6e21c988c458d12a1c649e75deebf0637f 100644
--- a/projects/arXMLiv.md
+++ b/projects/arXMLiv.md
@@ -3,6 +3,7 @@ layout: project
 menu_title: arXMLiv  
 title: arXMLiv
 start: 2006
+pillar: semantization
 people: mkohlhase,dginev
 ---
 The [Cornell e-print arXiv](http://arxiv.org) contains one of the largest corpora of scientific literature in the world. Unfortunately, its contents are locked up in the TeX/LaTeX format, which makes it nearly useless for knowledge management techniques. We translate it to XML to have a basis for uncovering it's structural semantics.