diff --git a/server/web2py/applications/vidjil/models/sample_set_list.py b/server/web2py/applications/vidjil/models/sample_set_list.py
index 8d96ed92a15ea7ebb405f51e604d4d1b95e3d168..76951a3625635dd137e187fb6d4945401e0e5b71 100644
--- a/server/web2py/applications/vidjil/models/sample_set_list.py
+++ b/server/web2py/applications/vidjil/models/sample_set_list.py
@@ -31,6 +31,7 @@ class SampleSetList():
                     (db.auth_membership.group_id == db.auth_group.id))
                 ]
 
+        # SQL string with GROUP_CONCAT queries
         group_configs = get_conf_list_select()
         group_config_ids = get_config_ids_select()
         group_config_names = get_config_names_select()