diff --git a/README.md b/README.md
index 8cf68d8aea114cfa516dbb34b020618e490b1fec..34b5b1af13fc106cbee7df489e244a2fb220ebaa 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,5 @@ In the webform content type create a field
 On "Manage Display" hide the field (unless you want everybody to know who may
 access the results).
 
+depends on References module : "https://www.drupal.org/project/references" (for user reference field)
+