Confusing instructions about the 'Columns' field in JIRA Issues Macro

After embedding a JQL Query in Confluence using the 'JIRA Issues' Macro the instructions on how to place the columns you want to display are confusing.

For instance, if you want to display the key, summary and type columns, looking at the instructions underneath the field, you will end up placing something like this:

key, summary, type

However, if you do that, you'll only get the key as a result. The problem lies in the fact that there should be no spaces between the selected fields. Actually, you should place this:

key,summary,type

Would be nice to have an (e.g. key,summary,etc) within the instructions.