diff --git a/journalbeat.reference.yml b/journalbeat.reference.yml
index f9ad8dab8d2..f48abb827a9 100644
--- a/journalbeat.reference.yml
+++ b/journalbeat.reference.yml
@@ -269,6 +269,16 @@ setup.template.settings:
 #    max_depth: 1
 #    target: ""
 #    overwrite_keys: false
+#
+# The following example copies the value of message to message_copied
+#
+#processors:
+#- copy_fields:
+#    fields:
+#        - from: message
+#          to: message_copied
+#    fail_on_error: true
+#    ignore_missing: false
 
 #============================= Elastic Cloud ==================================