Index: sysutils/graylog/files/pkg-message.in
===================================================================
--- sysutils/graylog/files/pkg-message.in
+++ sysutils/graylog/files/pkg-message.in
@@ -12,12 +12,23 @@
 For a single-node installation, install:
 
 - databases/mongodb40 or higher
-- textproc/elasticsearch5 or higher
+- textproc/elasticsearch6.8 or higher
 
 And ensure that the elasticsearch cluster name matches that used by graylog.
 
 The locations for configuration files have changed to match upstream
 versions in 3.0 of this port, refer to UPDATING for migration steps.
+
+!!! UPDATE 4.0 BREAKING CHANGES !!!
+
+Please make sure to create a MongoDB database backup before starting the 
+upgrade to Graylog 4.0!
+- Support for Elasticsearch versions prior to v6.8.0 is dropped.
+- Support for Elasticsearch v7.x is now included.
+- LDAP and Active Directory configuration changes: All existing LDAP settings 
+will automatically be migrated to the new backend but are disabled by default,
+you'll need to enable with a admin user.
+
 EOM
 }
 ]