railsbench can't parse benchmarks.yml correctly

Apologies in advance for the lengthy/somewhat dry (not DRY) post, but this is a real frustrating problem here, so I'd love some help:

I installed the railsbench gem, and set up my benchmarks.yml file just like it said:

default:   index

index:   uri: /test/index   new_session: true

When I run "railsbench perf_run 5" it works fine. But I want to test 1000 URLs, so as the docs suggested I changed benchmarks.yml to this:

default:   index, other

index:   uri: /test/index   new_session: true