docs or examples of vcl.inline seem to be scarce.

[Mike Gracy]

I'm trying to figure out how to add a backend to an existing config:
vcl.inline boot "backend wiki { .host = "wiki.idle-gaems.com"; .port = "80"; }"
105 64
Unknown request.
Type 'help' for more info.
Too many parameters

Is this only for the use of including C code?