Create new Keyword by pressing "enter" not working

Not sure if this is a bug, or a problem with the tutorial.

In the section 5e:Keywords, it states that (in the Keyword Table) you can " add keywords by clicking on the “+” button, or by hitting enter while another keyword is selected."

Except I cant get that to work. Nothing happens when I hit “enter” with a keyword selected in the table.

Using Windows 7.

(Also, I found the references to “Keyword Table” and “Reference Table” etc in the tutorial just a little confusing, as it did not explain which part of the interface these refer to. But maybe I missed something. )