Documents Excluded from Indexing (Platform Search Application)

In the Properties of the Platform Search Application, there is a box labeled 'Documents Excluded from Indexing'. The XI 4 What's New (SAP BusinessObjects Business Intelligence Suite Document Version: 4.0 Support Package 10 - 2014-07-24) has this information:

"Documents Excluded from Indexing: Manually enter the document IDs of the Info Objects that you do not want to get indexed".

If you have more than one document ID, how do you enter them? Do you use a delimiter (such as comma or semicolon)?