diff --git a/setup.py b/setup.py
index e5d4e5f..f91c39e 100644
--- a/setup.py
+++ b/setup.py
@@ -9,4 +9,5 @@ setup(
     author_email='guillaume.raffy@univ-rennes1.fr',
     license='MIT',
     packages=['cocluto'],
+    requires=['pygraphviz'],  # requires apt install graphviz-dev
     zip_safe=False)