diff --git a/config b/config
index 8f7b616..a0346fc 100644
--- a/config
+++ b/config
@@ -34,7 +34,7 @@ stock = utf-8
 
 [acl]
 # Access method
-# Value: None | htpasswd | LDAP
+# Value: None | htpasswd | LDAP | PAM
 type = None
 # Usernames used for public calendars, separated by a comma
 public_users = public
@@ -56,6 +56,8 @@ ldap_attribute = uid
 ldap_binddn =
 # LDAP password for initial login, used with ldap_binddn
 ldap_password =
+# PAM group user should be member of
+group_membership =
 
 [storage]
 # Folder for storing local calendars, created if not present