diff --git a/readme.md b/readme.md
index 03130b2..922ff2b 100644
--- a/readme.md
+++ b/readme.md
@@ -32,6 +32,7 @@ or for bibtex containing a single file:
 Requirements
 ------------
 - python >= 2.6
+- [dateutil](http://labix.org/python-dateutil)
 - [pyYaml](http://pyyaml.org)
 - [bibtexparser](https://github.com/sciunto/python-bibtexparser)
 
diff --git a/setup.py b/setup.py
index d9221aa..feaa100 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ setup(name='pubs',
       author_email='fabien.benureau+inria@gmail.com',
       url='',
       description='research papers manager',
-      requires=['bibtexparser', 'pyyaml'],
+      requires=['pyyaml', 'bibtexparser', 'dateutil'],
       packages=find_packages(),
       scripts=['pubs/pubs']
       )