Serverless.yml usagePlan

Are there any docs that provide detailed description of the .yml settings for aws? I found this page

At the moment - I’d like to know more about what these usagePlan/quote settings mean?

usagePlan: # Optional usage plan configuration
limit: 5000
offset: 2
period: MONTH
burstLimit: 200
rateLimit: 100

I don’t know the specific answer here, and I have some other questions in another thread about some other serverless.yml parameters (docs are sparse). What I have found is that in a lot of cases the keywords / syntax / usage / etc in serverless.yml often maps directly, or pretty closely to cloudformation. For instance these might help:

Ah - thanks very much. I guess it makes sense that a lot of this would be pass-through. I will look there!