CDM Json Model

When building a dataflow you can create a json model to define the cdm.  The documents can be found here. https://docs.microsoft.com/en-us/common-data-model/model-json#attributes

It says you can define the "description" of the "attributes" along with name and datatype.  I can set the name and datatype just fine but when I define a description nothing happens.  I expected to see it in the description in the model, but nothing!  Am I doing something wrong?  Is the description not working?  Does it not show up in the model, if not what is the purpose of adding a description?