diff --git a/oidc_provider/settings.py b/oidc_provider/settings.py
index 0ca5d16..9533f93 100644
--- a/oidc_provider/settings.py
+++ b/oidc_provider/settings.py
@@ -67,6 +67,19 @@ class DefaultSettings(object):
         """
         return 60*60
 
+    @property
+    def OIDC_USER_CONSENT_ENABLE(self):
+        """
+        OPTIONAL.
+        """
+        return True
+
+    @property
+    def OIDC_USER_CONSENT_EXPIRE(self):
+        """
+        OPTIONAL.
+        """
+        return 30*3
 
 default_settings = DefaultSettings()