diff --git a/local_settings.py.example b/local_settings.py.example
index c29e52e..32c7346 100644
--- a/local_settings.py.example
+++ b/local_settings.py.example
@@ -24,6 +24,9 @@ DATABASES = {
 #    }
 #}
 
+# The default site URL
+SITE_URL = 'https://polynum.univ.fr'
+
 #
 # Upload directory (polynum must have read+write permissions on it)
 #
diff --git a/polynum/settings.py b/polynum/settings.py
index 658c55b..a85fcc5 100644
--- a/polynum/settings.py
+++ b/polynum/settings.py
@@ -41,6 +41,8 @@ LANGUAGE_CODE = 'fr-fr'
 
 SITE_ID = 1
 
+SITE_URL = 'http://polynum.example.com'
+
 # If you set this to False, Django will make some optimizations so as not
 # to load the internationalization machinery.
 USE_I18N = True