diff --git a/ckanext/odsh/plugin.py b/ckanext/odsh/plugin.py
index a97dcbeaf1bc4cd7aeff64a118111b4c283bccc3..3dfc22ab246746e60cb7c1f9cc232f779e5e7e66 100644
--- a/ckanext/odsh/plugin.py
+++ b/ckanext/odsh/plugin.py
@@ -111,6 +111,7 @@ class OdshPlugin(plugins.SingletonPlugin, DefaultTranslation, DefaultDatasetForm
         schema['extras'].update({
             'key': [
                 toolkit.get_converter('known_spatial_uri'),
+                toolkit.get_converter('validate_licenseAttributionByText'),
             ]
         })
         schema.update(