WCF Help Page: add comments?

Question

I have made Help Page as described here: https://msdn.microsoft.com/en-us/library/ee230442(v=vs.110).aspx

Now the output looks like this:

Url: http://localhost/IDataRESTService/getnode/{NODE_ID}?t={TYPE}
HTTP Method: GET
Message direction   Format  Body
Request     N/A     The Request body is empty.
Response    Unknown     The Response body cannot be inferred

1. Is it possible to add comments to the standard WCF Help Page? For example: I'd like to add parameters description, how to use the method etc.

2. Is it possible to add to the output formatted comments /// from the source code?