you should add reference letter.for detail plz check the link below
http://www.saskatchewan.ca/residents/moving-to-saskatchewan/immigrating-to-saskatchewan/saskatchewan-immigrant-nominee-program/applicants-international-skilled-workers/international-skilled-worker-saskatchewan-express-entry/required-documents-for-saskatchewan-express-entry
You should add reference letter which should include your job title and job responsibilities,number of years you worked for,remuneration,contact detail of your employer/supervisor.the detail ,you can check in the link below.
http://www.saskatchewan.ca/residents/moving-to-saskatchewan/immigrating-to-saskatchewan/saskatchewan-immigrant-nominee-program/applicants-international-skilled-workers/international-skilled-worker-saskatchewan-express-entry/required-documents-for-saskatchewan-express-entry