diff --git a/doc/Extensions/Authentication.md b/doc/Extensions/Authentication.md
index eee0915b9d..d7c526d36d 100644
--- a/doc/Extensions/Authentication.md
+++ b/doc/Extensions/Authentication.md
@@ -110,6 +110,12 @@ This is similar to LDAP Authentication. Install __php_ldap__ for CentOS/RHEL or
 
 If you have issues with secure LDAP try setting `$config['auth_ad_dont_check_certificates']` to `1`.
 
+##### Require actual membership of the configured groups
+
+If you set ```$config['auth_ad_require_groupmembership']``` to 1, the authenticated user has to be a member of the specific group. Otherwise all users can authenticate, but are limited to user level 0 and only have access to shared dashboards. 
+
+##### Sample configuration
+
 ```
 $config['auth_ad_url'] = "ldaps://your-domain.controll.er";
 $config['auth_ad_dont_check_certificates'] = 1; // or 0
@@ -117,4 +123,5 @@ $config['auth_ad_domain'] = "your-domain.com";
 $config['auth_ad_base_dn'] = "dc=your-domain,dc=com";
 $config['auth_ad_groups']['admin']['level'] = 10;
 $config['auth_ad_groups']['pfy']['level'] = 7;
+$config['auth_ad_require_groupmembership'] = 0;
 ```