Is it mentioned in Nomination letter?
Personally, I will follow CIC checklists because CIC will check documents based on check lists only if you are not following check lists document then CIC will return back your applications.
However, you can include NS100 form as supporting document. It doesn't hurt but avoid unnecessary documents.
Source,
http://www.cic.gc.ca/english/information/applications/guides/EP7TOC.asp#ep73
What documents are required?
Use the Document Checklist (IMM 5690) to assist you in gathering the necessary documentation.
Important information
If you do not provide all the requested information and the documents from the checklist, your application will be returned to you.
NurseBaker said:
Not mentioned in cic checklist but nsnp said to attach a photocopy. Confusing. Those who sent to cic, did you attach?