diff --git a/EDdA/data.py b/EDdA/data.py
index 91d287dcad0b3edd30713a6a141845c611b13fe5..2243c1c3b9a8da4de365023657eab832f9dd98d4 100644
--- a/EDdA/data.py
+++ b/EDdA/data.py
@@ -30,5 +30,7 @@ domains = [
            'Pêche', 'Religion', 'Spectacle', 'Superstition'
         ]
 
+domainId = dict([(domains[k], k) for k in range(0, len(domains))])
+
 def domain(articles, name):
     return articles[articles.ensemble_domaine_enccre == name]