Add comment to clarify in which use case the consumer submissionconfi…

…g is useful

dspace/config/dspace.cfg

@@ -831,6 +831,11 @@ event.consumer.ldnmessage.class = org.dspace.app.ldn.LDNMessageConsumer
 event.consumer.ldnmessage.filters = Item+Install
 
 # item submission config reload consumer
+# This consumer can be useful for reloading changes made in the item-submission.xml config file,
+# without restarting Tomcat, primarily for adding new collection mappings.
+# With this consumer, configuration reloading is triggered after a collection is updated.
+# It is disabled by default. To enable it, add 'submissionconfig' to the list of
+# activated consumers (event.dispatcher.default.consumers).
 event.consumer.submissionconfig.class = org.dspace.submit.consumer.SubmissionConfigConsumer
 event.consumer.submissionconfig.filters = Collection+Modify_Metadata